Traffic Impact Analysis West Street Garden Plots Improvements and DuPage River Park Garden Plots Development Naperville, Illinois

Transcription

1 Traffic Impact Analysis West Street Garden Plots Improvements and DuPage River Park Garden Plots Development Naperville, Illinois Submitted by April 9, 2009

2 Introduction Kenig, Lindgren, O Hara, Aboona, Inc. (KLOA, Inc.) was retained by the Naperville Park District to provide traffic impact and site access studies for both the West Street Garden Plots improvements and the proposed DuPage River Park Garden Plots development. The West Street Garden Plots are located on the west side of West Street, roughly between Martin Avenue and Emerald Drive in Naperville, Illinois. Currently, there are 587 garden plots. As proposed, two multi-purpose athletic fields with an approximate 120-space surface parking lot are to be located at the southern portion of the site and will replace approximately 101 garden plots. Approximately 478 garden plots will remain at the site. The garden plots are currently served by three, full access roadways. As part of the proposed improvements, the existing southern access drive will be realigned to intersect West Street opposite Osler Drive, becoming the west/fourth leg to this existing T-intersection of West Street and Osler Drive. The DuPage River Park Garden Plots proposed development will be located in the southeast quadrant of the intersection of Washington Street and Royce Road in Naperville, Illinois. The development will include approximately 332 garden plots in addition to a Park District maintenance driveway. Also, a ten-foot wide multi-use trail will be constructed near the proposed location. Access to this development will be served by a full access driveway on Royce Road, in alignment with Apple River Lane, becoming the fourth/south leg to this existing T-intersection and a restricted right-turn in/right-turn out driveway on Royce Road. The purpose of these studies was to examine the impact each of these proposed developments would have on the surrounding roadway network in conjunction with regional growth, and planned future roadway and traffic control improvements for Year 2010 conditions. Section A of this report provides the traffic impact and access study relating to the West Street Garden Plots improvements. The conclusions and recommendations of this study are located on Page A-24. Section B of this report provides the traffic impact and access study relating to the proposed DuPage River Park Garden Plots development. The conclusions and recommendations of this study are located on Page B-17. Naperville Park District Naperville, Illinois i

3 Section A West Street Garden Plots Redevelopment Introduction This section of the report summarizes the methodologies, results and findings of a site traffic analysis conducted for the proposed redevelopment of the West Street Garden Plots located on the west side of West Street, roughly between Martin Avenue and Emerald Drive in Naperville, Illinois. Figure A-1 shows the location of the site in relation to the area roadway system. Figure A-2 shows an aerial view of the site area. Per the direction of the City of Naperville, the following seven intersections were analyzed as part of this study: 1. Hillside Road and West Street 2. Martin Avenue and West Street 3. Osler Drive and West Street 4. Emerald Drive and West Street 5. North Garden Plot Access and West Street 6. Middle Garden Plot Access and West Street 7. South Garden Plot Access and West Street The following sections of this report present the following: Existing roadway conditions, including traffic volumes for the weekday midday, weekday evening, and Saturday midday peak hours A detailed description of the proposed redevelopment Vehicle trip generation for both the multi-purpose athletic fields and the remaining garden plots Directional distribution of development-generated traffic Regional ambient growth in traffic Traffic analyses conducted for the weekday midday and evening and Saturday midday peak hours for the following three conditions: 1. Existing Conditions - Analyzes the capacity of the existing roadway system using currently recorded traffic volumes in the surrounding area. 2. No-Build Conditions (Year 2010) This condition includes increasing the existing traffic volumes by a regional growth factor in addition to the traffic generated by the existing garden plots. This condition does not include the traffic generated by the proposed multi-purpose athletic fields. Naperville Park District Naperville, Illinois A-1

4 ^ North SITE Site Location Figure A-1 Naperville Park District Naperville, Illinois A-2

5 Aerial View of Site Location Figure A-2 Naperville Park District Naperville, Illinois A-3

6 3. Projected Conditions (Year 2010) This condition includes the No-Build condition projected traffic volumes in addition to the traffic generated by the two proposed multi-purpose athletic fields. Future transportation conditions, including access to and from the site and planned roadway improvements. The purpose of this study was to examine the impact this proposed development would have on the surrounding roadway network in conjunction with regional growth for both Year 2010 No-Build and Year 2010 Projected conditions. Existing Conditions Existing traffic and roadway conditions were documented based on field visits and traffic counts conducted by KLOA, Inc, as well as previously conducted traffic counts provided by the City of Naperville. The following provides a detailed description of the physical characteristics of the roadways including geometry and traffic control, adjacent land uses and peak hour traffic flows along area roadways. Description of Study Area The area surrounding the site is composed of a mixture of land uses. Naperville Central High School (NCHS) is located in the northeast quadrant of the intersection of West Street and Hillside Road. Various Naperville Park District parks and athletic fields are located north and east of the site and the Edward Hospital Campus is located east of the site. Lastly, residential neighborhoods are located south and west of the site. Existing Roadway System Characteristics The characteristics of the existing roadways that surround the proposed development are illustrated in Figure A-3 and described below. West Street is a four-lane north-south arterial with a posted speed limit of 30 mph. West Street is under the jurisdiction of the City of Naperville. Parking is prohibited on both sides of the roadway. Sidewalks are provided on both sides of the roadway. A pedestrian signal crossing, complete with advanced warning signage and pedestrian signal heads is provided between Martin Avenue and Osler Drive, just south of the Middle Garden Plot access driveway. At its signalized intersection with Hillside Road, West Street provides a left-turn lane and two through lanes on the north approach, and a through lane and a shared through/right-turn lane are provided on the south approach. Crosswalks are provided on the north and east legs of the intersection and the traffic signal is equipped with pedestrian signals and call button features. At its signalized intersection with Martin Avenue, a left-turn lane, through lane, and a shared through/right-turn lane are provided on both the north and south approaches on West Street. Crosswalks are provided on both Naperville Park District Naperville, Illinois A-4

7 the north and east legs of the intersection and the traffic signal is equipped with pedestrian signals and call button features. At its unsignalized intersection with Osler Drive, a left-turn lane and two through lanes are provided on the north approach, and a through lane and a shared through/right-turn lane are provided on the south approach. At its all-way stop controlled intersection with Emerald Drive, a left-turn lane and two through lanes are provided on the north approach, and a through lane and a shared through/right-turn lane are provided on the south approach. Crosswalks are provided on both the north and east legs of this intersection. Hillside Road is a two-lane east-west road that terminates at West Street. Parking is permitted on both sides of the roadway. At its signalized intersection with West Street, a left-turn lane and a right-turn lane are provided. As noted, pedestrian crosswalks are provided on both the north and east legs of this intersection. Hillside Road is under the jurisdiction of the City of Naperville and has a posted speed of 25 mph. Martin Avenue is a two-lane east-west road that terminates at West Street. The west leg of this intersection is the access driveway to the Sportsman s Park parking lot. The Martin Avenue approach provides a separate left-turn lane and a shared through/right-turn lane. As noted, pedestrian crosswalks are provided on both the north and east legs of this intersection. Martin Avenue has a posted speed of 30 mph. Parking is restricted to a four-hour limit between 6:00A.M. and 6:00 P.M. on both sides of the roadway. Martin Avenue is under the jurisdiction of the City of Naperville. Osler Drive is a two-lane east-west local road that terminates at West Street and serves the Edward Hospital Campus. The Osler Drive approach provides a left-turn lane and a right-turn lane and is under stop sign control. The posted speed limit is 25 mph, and parking is permitted on both sides of the roadway. Osler Drive is a private road. Emerald Drive is a two-lane local road that T-intersects West Street from the East, providing a single lane at its all-way stop intersection with West Street. As noted, pedestrian crosswalks are provided on both the north and east legs of this intersections. The posted speed limit is 25 mph, and parking is permitted on both sides of the roadway. Emerald Drive is under the jurisdiction of the City of Naperville. North Garden Plot Access is located at the north end of the West Street Garden Plot development, between Martin Avenue and Osler Drive. At its T-intersection with West Street, a single lane approach is provided, allowing left- or right-turn movements onto West Street. Middle Garden Plot Access is located south of North Access, aligning with the parking lot access driveway to Knoch Park, located on the east side of West Street. South Garden Plot Access is located just south of Osler Drive, providing a single-lane approach at its T-intersection with West Street. Naperville Park District Naperville, Illinois A-5

8 HILLSIDE RD 25 MPH NOT TO SCALE LEGEND - TRAVEL LANE - TRAFFIC SIGNAL - STOP SIGN - PEDESTRIAN CROSSWALK MARTIN AVE 30 MPH NORTH ACCESS MIDDLE ACCESS - PED-XING SITE OSLER DR 25 MPH SOUTH ACCESS EMERALD 25MPH WEST ST 30M PH DR PROJECT: TITLE: PROJECT NO: WEST ST GARDEN PLOTS NAPERVILLE, ILLINOIS EXISTING ROADWAY CHARACTERISTICS FIGURE NO: A-3

9 Existing Traffic Volumes Manual turning movement traffic counts were conducted on a weekday midday between 11:00 A.M. and 4:00 P.M., and evening 4:00 P.M. and 7:00 P.M. periods and on a Saturday midday period between 10:00 A.M. and 4:00 P.M. at the following intersections: West Street and Osler Drive West Street and Emerald Drive West Street and North Garden Plot Access West Street and Middle Garden Plot Access West Street and South Garden Plot Access In addition, previous traffic counts conducted by the City of Naperville were provided for the intersections of West Street and Hillside Road and West Street and Martin Avenue. These two intersections were not evaluated for the Saturday midday peak hour condition since the school traffic and pedestrian activity is significantly lower compared to a weekday, and the volumes on West Street are lower compared to a weekday, especially the weekday evening peak hour. From the manual turning movement count data, it was determined that the weekday midday peak hour occurs between 3:00 and 4:00 P.M., the weekday evening peak hour occurs between 5:00 and 6:00 P.M., and the Saturday midday period occurs between 2:00 and 3:00 P.M. Per the direction from the City of Naperville, the signalized intersections of West Street and Hillside Road and West Street and Martin Avenue were not analyzed for the Saturday midday peak hour period. Figure A-4 shows the existing peak hour traffic volumes at the respective intersections. It should be noted that minimal traffic volumes were recorded at the West Street Garden Plots access driveways since the counts were conducted during the off-peak growing season. As will be shown further in this study, traffic for peak growing season was included when projecting for both Year 2010 No-Build and Year 2010 Total Traffic conditions. Lastly, per the request of the City of Naperville, the Saturday counts conducted in March 2009 were compared to previous counts conducted in June A review of the counts indicates that West Street experiences a minor increase in traffic between March and June. Naperville Park District Naperville, Illinois A-7

10 00 NOT TO SCALE HILLSIDE RD LEGEND - WEEKDAY MIDDAY PEAK HOUR 50 (70) 660 (805) 120 (170) 150 (190) 100 (175) MARTIN AVE PROJECT: TITLE: PROJECT NO: WEST ST GARDEN PLOTS EXISTING TRAFFIC VOLUMES NAPERVILLE, ILLINOIS FIGURE NO: WEST ST 430 (500) [420] 30 (25) [20] DR EMERALD 175 (140) [90] 20 (25) [20] OSLER DR MIDDLE ACCESS SOUTH ACCESS NORTH ACCESS (00) [00] - WEEKDAY PM PEAK HOUR - SATURDAY MIDDAY PEAK HOUR SITE 0 (0) [0] 0 (0) [0] 0 (0) [0] 0 (0) [0] 0 (0) [0] 565 (895) [400] 215 (180) [115] 780 (1075) [515] 635 (980) [425] 25 (25) [45] 0 (0) [0] 605 (640) [510] 540 (545) [425] 0 (0) [0] 615 (605) [505] 65 (95) [85] 0 (0) [0] 0 (0) [0] 0 (0) [0] 660 (1005) [470] 0 (0) 0 (5) 0 (0) 0 (0) [0] 660 (1005) [470] 0 (0) [0] 615 (605) 5 (0) [505] 560 (560) 50 (45) 5 (0) 580 (850) 175 (130) 680 (665) 170 (175) 5 (0) 80 (155) 75 (60) [80] 145 (95) [90] A-4

11 Accident Data Accident data from January 1, 2005 through December 21, 2007 was provided by the City of Naperville for the various intersections in the study area. The following summarizes the accident data. The intersection of West Street and Hillside Road experienced a total of 32 accidents in the three year period. The intersection of West Street and Martin Avenue experienced a total of 20 accidents in the three year period. The intersection of West Street and Osler Drive experienced a total of 11 accidents in the three year period. The intersection of West Street and Emerald Drive experienced a total of 13 accidents in the three year period. Traffic Characteristics of the West Street Garden Plots Redevelopment To evaluate the impact of the subject development on the area roadway system, it was necessary to quantify the number of vehicle trips the site will generate during the weekday midday, evening, and Saturday midday peak hours and then determine the directions from which this traffic will approach and depart the site. Proposed West Street Garden Plots Redevelopment Currently, the West Street Garden Plots provides 587 garden plots. As part of the improvements, approximately 478 garden plots will be provided in addition to two multi-purpose athletic fields. As proposed, the athletic fields will be used by both the Naperville Park District, as well as students from Naperville Central High School (which is located in the northeast quadrant of the intersection of West Street and Hillside Road). Multi-purpose Athletic Fields The two fields will be located at the south end of the parcel. On weekday evenings, the two fields will be used for football and lacrosse practice by NCHS students. On the weekends, typically throughout the day, the fields will primarily be used for soccer, football, or lacrosse games for Naperville Park District related programs. According to the Naperville Park District, most of the NCHS students will walk to/from the campus to these athletic fields. As noted, the area provides numerous facilities to accommodate pedestrians. These pedestrian facilities include sidewalks on both sides of West Street, established crosswalks at the signalized intersections of both Martin Avenue and Hillside Road, and a formal pedestrian crossing signal, located just south of the Middle Garden Plot access driveway. Naperville Park District Naperville, Illinois A-9

12 West Street Garden Plots The garden plots are used primarily in late Spring through early Fall (growing season) and are typically accessible from dawn to dusk, seven days a week. Based on a survey conducted in November 2008 by the Naperville Park District, approximately 83% of the respondents indicated that they travel to/from the Garden Plots by automobile, and that 64% of the respondents maintain only one garden plot. In addition, 80% of the respondents have been using these garden plots for two years (or two growing seasons) or more. As such, the motorists accessing these plots are quite familiar with the surrounding area roadway network and pedestrian-related facilities. Site Access Access to the site is proposed to be provided as follows: North Garden Plot Access driveway will remain open and in its current location, providing full access to/from West Street. Middle Garden Plot Access driveway will remain open and in its current location, opposite the parking lot serving Knoch Park, providing full access to/from West Street. South Garden Plot Access driveway will be relocated to align with Osler Drive, becoming the fourth/west leg to this existing T-intersection with West Street. This access will continue to provide full access to/from West Street, as well as Osler Drive. Parking An approximate 120-space surface parking lot will be added to serve the proposed multi-purpose athletic fields. The City of Naperville s parking ordinance requires 35 parking spaces per athletic field. Therefore, the proposed parking has an excess capacity of 50 parking spaces, which will be sufficient to accommodate parking turnover during game transitions. Directional Distribution of Site Traffic The directional distribution of how traffic will approach and depart the site was estimated based on existing travel patterns in the area, as well as the direction and proximity of established residential neighborhoods that may use both the garden plots and the multi-purpose athletic fields. The anticipated directional distribution is tabulated in Table A-1 and illustrated in Figure A-5. Naperville Park District Naperville, Illinois A-10

13 40% NOT TO SCALE LEGEND HILLSIDE RD 10% 00% - PERCENTAGE DISTRIBUTION MARTIN AVE 15% NORTH ACCESS MIDDLE ACCESS SITE ACCESS OSLER DR 0% WEST ST 20% EMERALD 15% DR PROJECT: TITLE: PROJECT NO: WEST ST GARDEN PLOTS NAPERVILLE, ILLINOIS EXISTING DIRECTIONAL DISTRIBUTION FIGURE NO: A-5

14 Table A-1 DIRECTIONAL DISTRIBUTION OF SITE-GENERATED TRAFFIC Direction To/From Percentage Distribution North on West Street 40% South on West Street 20% East on Hillside Road 10% East on Martin Avenue 15% East on Emerald Drive 15% East on Osler Drive 0% Total: 100% Site Traffic Generation West Street Garden Plots As noted, the existing traffic counts were conducted in March 2009 during off-peak growing season, thereby recording minimal traffic accessing the garden plots. Based on information provided by the Naperville Park District, trip generation estimates were developed for the weekday midday, evening, and Saturday midday peak hour periods during peak growing season. The trip estimates are based on the planting season which represents the peak activity of the garden plots, thereby providing a conservative estimate of vehicle trips. These trip estimates are tabulated in Table A-2. Table A-2 ESTIMATED WEST STREET GARDEN PLOTS TRAFFIC VOLUMES (PEAK GROWING SEASON) Peak Hour Period In Out Total Weekday Midday Weekday Evening Saturday Midday As shown in Table A-2, the West Street Garden Plots generates a low volume of traffic during each of the three studied peak hours. The Saturday midday peak hour is estimated to generate the highest volume of traffic with an expected 80 two-way vehicle trips. Naperville Park District Naperville, Illinois A-12

15 Site Traffic Generation Multi-Purpose Athletic Fields The estimates of traffic to be generated by the proposed multi-purpose athletic fields was estimated using data published in the Institute of Transportation Engineers (ITE) Trip Generation Manual, 8 th Edition. It should be noted that the Trip Generation Manual does not provide rates for the weekday midday peak period. As such, the Saturday midday peak period were used which provides for a very conservative (worst case) analysis. Table A-3 tabulates the total trips anticipated with this development for the weekday midday, weekday evening, and Saturday midday peak hours. Table A-3 ESTIMATED MULTI-PURPOSE ATHLETIC FIELDS TRAFFIC VOLUMES Peak Hour Period In Out Total Weekday Midday Weekday Evening Saturday Midday As noted, the athletic fields will be used by NCHS students, where a majority of them will walk to/from the campus and athletic fields. However, the trip generation has not been reduced to consider pedestrian activity, thereby also providing a conservative study. Site Traffic Assignment The peak hour traffic volumes projected to be generated by the two multi-purpose athletic fields (refer to Table A-3) were assigned to the area roadways based on the directional distribution analysis (Figure A-5). Figure A-6 shows the assignment of the site-generated peak hour traffic volumes. Regional Traffic Growth To obtain Year 2010 traffic volumes, the existing traffic volumes (Figure A-4) were increased by an overall regional growth factor of three percent per year applied for one year (2009 to 2010). It should be noted that a one to one and a half percent per year regional growth factor is typical for this area. However, a greater growth factor was used to account for any additional traffic that may be generated by the Naperville Central High School expansion, to compensate for the previously recorded traffic volumes that were conducted in Year 2007 and Year 2008, and the fact that the updated traffic counts were conducted in March. Naperville Park District Naperville, Illinois A-13

16 10 (13) [10] NOT TO SCALE 2 (2) [2] HILLSIDE RD 00 (00) [00] LEGEND - WEEKDAY MIDDAY PEAK HOUR - WEEKDAY PM PEAK HOUR - SATURDAY MIDDAY PEAK HOUR 12 (15) [12] 14 (4) [14] 4 (1) [4] 3 (3) [3] MARTIN AVE NORTH ACCESS 18 (5) [18] MIDDLE ACCESS SITE ACCESS 12 (4) [12] 15 (18) [15] OSLER DR 7 (3) [7] 5 (1) [5] 5 (1) [5] 23 (6) [23] 10 (12) [10] 3 (3) [3] WEST ST 7 (9) [7] EMERALD DR PROJECT: TITLE: PROJECT NO: WEST ST GARDEN PLOTS NAPERVILLE, ILLINOIS SITE-GENERATED TRAFFIC VOLUMES (MULTI-PURPOSE ATHLETIC FIELDS) FIGURE NO: A-6

17 Year 2010 No-Build Traffic Volumes The Year 2010 No-Build condition includes the existing traffic volumes increased by the regional growth factor of three percent, as well as the traffic generated by the existing garden plots during peak growing season. Figure A-7 shows the estimated No-Build traffic volumes. Planned Roadway Improvements Christopher B. Burke Engineering, Ltd. (CBBEL) has been retained by the City of Naperville to prepare a feasibility study for the reconfiguration of the West Street/Emerald Drive and West Street/Osler Drive intersections to improve safety, access and traffic flow. Currently, both intersections carry a high volume of traffic and experience some operational problems during the peak periods. It is our understanding that both intersections meet the peak hour volume warrant for the installation of a traffic signal. As of the date of the traffic study, the feasibility study was not completed. Year 2010 Total Projected Traffic Conditions The Year 2010 Total Projected Traffic condition incorporates the Year 2010 No-Build traffic volumes (Figure A-7), and the proposed athletic fields generated traffic volumes (Figure A-6). Figure A-8 shows the total projected traffic volumes for Year 2010 conditions. This condition assumes the south access driveway is now in alignment with Osler Drive, and a new access driveway is in alignment with Emerald Drive. Naperville Park District Naperville, Illinois A-15

18 00 NOT TO SCALE HILLSIDE RD LEGEND - WEEKDAY MIDDAY PEAK HOUR 705 (700) 55 (75) 690 (837) 125 (175) 155 (195) 105 (180) MARTIN AVE PROJECT: TITLE: PROJECT NO: WEST ST GARDEN PLOTS NAPERVILLE, ILLINOIS FIGURE NO: WEST ST 456 (528) [451] 35 (30) [25] DR EMERALD 180 (145) [95] 25 (30) [25] OSLER DR MIDDLE ACCESS SOUTH ACCESS NORTH ACCESS (00) [00] - WEEKDAY PM PEAK HOUR - SATURDAY MIDDAY PEAK HOUR SITE 0 (0) [0] 0 (0) [0] 0 (5) [10] 5 (5) [10] 596 (925) [439] 220 (185) [120] 3 (4) [8] 633 (669) [538] 3 (4) [8] 664 (1009) [462] 0 (0) [0] 811 (1105) 30 (30) [50] 694 (1039) [549] [512] 563 (574) 0 (0) [0] 3 (4) [8] [458] 70 (100) [90] 643 (639) [543] 640 (635) [535] 5 (0) 585 (595) 55 (45) 5 (5) [10] 5 (5) [10] 3 (4) [8] 692 (1038) [510] 0 (0) 0 (5) 0 (0) 5 (0) 610 (882) 180 (135) 175 (180) 5 (0) 85 (160) 80 (65) [85] 150 (100) [95] YEAR 2010 NO-BUILD TRAFFIC VOLUMES A-7

19 00 HILLSIDE RD NOT TO SCALE LEGEND - WEEKDAY MIDDAY PEAK HOUR 59 (76) 700 (850) 125 (175) 155 (195) 107 (182) MARTIN AVE PROJECT: TITLE: PROJECT NO: WEST ST GARDEN PLOTS YEAR 2010 TOTAL TRAFFIC VOLUMES NAPERVILLE, ILLINOIS FIGURE NO: WEST ST 463 (537) [458] 35 (30) [25] DR EMERALD 183 (148) [98] 25 (30) [25] SITE OSLER DR MIDDLE ACCESS 0 (0) [0] 0 (0) [0] ACCESS 18 (22) [23] 607 (933) [450] 661 (1005) [454] 225 (186) [125] 30 (30) [50] 5 (5) [10] 5 (5) [10] NORTH ACCESS 3 (4) [8] 709 (1057) [527] 13 (16) [18] 0 (0) [0] 3 (4) [8] 563 (569) [448] 666 (645) [566] 663 (641) 5 (0) 70 (100) [90] [558] 603 (600) 60 (46) 80 (65) [85] 150 (100) [95] 3 (4) [8] 707 (1056) [525] (00) [00] - WEEKDAY PM PEAK HOUR - SATURDAY MIDDAY PEAK HOUR 0 (0) 0 (5) 0 (0) 23 (11) [33] 17 (9) [22] 5 (0) 622 (897) 180 (135) 724 (780) 175 (180) 5 (0) 88 (163) A-8

20 Traffic Evaluation The following provides an evaluation conducted for the weekday midday, weekday evening, and Saturday midday peak hour periods. The evaluation includes conducting capacity analyses to provide an indication of how well the existing roadway infrastructure accommodates the existing traffic volumes, as well as the anticipated traffic demands placed upon them for both Year 2010 No-Build and Year 2010 Total Traffic conditions. Traffic Analyses Roadway and adjacent or nearby intersection analyses were performed for the three peak hour periods for existing conditions, Year 2010 (No-Build condition) and Year 2010 (total traffic condition). The traffic analyses were performed using the methodologies outlined in the Transportation Research Board s Highway Capacity Manual (HCM), Synchro 6.0/SimTraffic software was used to perform the calculations. The analyses for the existing traffic-signal controlled intersections were accomplished using the existing signal phasings and cycle lengths to determine the average overall vehicle delay, volume-to-capacity ratios, and levels of service. The analyses for the unsignalized intersections determine the average delay a vehicle experiences at a stop sign controlled intersection. The delay (or control delay) is the elapsed time from a vehicle joining the queue at a stop sign (including the time required to decelerate to a stop) until its departure from the stop sign and resumption of free flow speed. The methodology analyzes each intersection approach controlled by a stop sign and considers traffic volumes on all approaches and lane characteristics. The ability of an intersection to accommodate traffic flow is expressed in terms of level of service, which is assigned a letter from A to F based on the average control delay experienced by vehicles passing through the intersection. Level of Service A is the highest grade (best traffic flow and least delay), whereas a Level of Service F is the lowest grade (oversaturated conditions, extensive delays). The Highway Capacity Manual definitions for levels of service and the corresponding control delay for both signalized and unsignalized intersections are included in the Appendix of this report. Summaries of the capacity analysis results for the three analyzed conditions are presented in Table A-4, Table A-5, and Table A-6, respectively. A discussion of the key intersections follows. As noted, the signalized intersections of Hillside Road and West Street and Martin Avenue and West Street were not analyzed for Saturday midday peak hour conditions. Naperville Park District Naperville, Illinois A-18

21 Table A-4 CAPACITY ANALYSES RESULTS EXISTING CONDITIONS Intersection Weekday Midday Peak Hour Weekday P.M. Peak Hour Saturday Midday Peak Hour Hillside Road at West Street (signalized) A 8.1 B 13.2 N/A Martin Avenue at West Street (signalized) A 8.2 B 11.4 N/A Osler Drive at West Street (TWSC) C 18.1 C 17.8 B 13.4 Emerald Drive at West Street (AWSC) C 16.8 E 38.2 B 10.8 TWSC = Two-way stop controlled intersection. AWSC = All-way stop controlled intersection. LOS represents the intersection as a whole for signalized intersections; for TWSC, the LOS is the minor approach under stop control. Delay is measured in seconds. Capacity analyses were not conducted for the Garden Plot access driveways because of the minimal volumes counted during off-peak growing season. N/A = Not Applicable. These intersections were not analyzed for this peak hour. Naperville Park District Naperville, Illinois A-19

22 Table A-5 CAPACITY ANALYSES RESULTS YEAR 2010 NO-BUILD CONDITIONS Intersection Weekday Midday Peak Hour Weekday P.M. Peak Hour Saturday Midday Peak Hour Hillside Road at West Street (signalized) A 8.3 B 13.4 N/A Martin Avenue at West Street (signalized) A 8.4 B 11.7 N/A Osler Drive at West Street (TWSC) C 19.4 C 18.9 B 14.2 Emerald Drive at West Street (AWSC) C 18.8 E 45.5 B 11.6 North Garden Plot Access at West Street B 13.2 C 16.6 B 12.5 Middle Garden Plot Access at West Street C 15.7 B 14.6 B 13.7 South Garden Plot Access at West Street B 12.4 C 18.1 B 12.4 TWSC = Two-way stop controlled intersection. AWSC = All-way stop controlled intersection. LOS represents the intersection as a whole for signalized intersections; for TWSC, the LOS is the minor approach under stop control. Delay is measured in seconds. N/A = Not Applicable. These intersections were not analyzed for this peak hour. Naperville Park District Naperville, Illinois A-20

23 Table A-6 CAPACITY ANALYSES RESULTS YEAR 2010 TOTAL PROJECTED CONDITIONS Intersection Weekday Midday Peak Hour Weekday P.M. Peak Hour Saturday Midday Peak Hour Hillside Road at West Street (signalized) A 8.4 B 13.9 N/A Martin Avenue at West Street (signalized) A 8.6 B 11.8 N/A Osler Drive/Access at West Street (TWSC) D 25.2 C 23.2 C 16.1 Emerald Drive at West Street (AWSC) C 19.7 E 47.8 B 11.9 North Garden Plot Access at West Street B 13.4 C 16.9 B 12.2 Middle Garden Plot Access at West Street C 16.0 C 20.4 B TWSC = Two-way stop controlled intersection. AWSC = All-way stop controlled intersection. Rdabt = Roundabout LOS represents the intersection as a whole for signalized intersections; for TWSC, the LOS is the minor approach under stop control. Delay is measured in seconds. N/A = Not Applicable. These intersections were not analyzed for this peak hour. Naperville Park District Naperville, Illinois A-21

24 Discussion and Recommendations Recommended geometric and traffic control improvements are identified below. Hillside Road and West Street The capacity analyses show that this intersection currently operates at an acceptable level of service for both the weekday midday and weekday evening peak hours and will continue to operate at an overall acceptable level of service for both the Year 2010 No-Build and Year 2010 Total Traffic conditions. Therefore, no geometric (i.e. widening of the roadway) or traffic control improvements are required in conjunction with the West Street Garden Plots redevelopment program. Martin Avenue and West Street Similar to the Hillside Road intersection, this intersection will continue to operate at the same level of service for both projected conditions. Therefore, no geometric (i.e. widening of the roadway) or traffic control improvements are required in conjunction with the West Street Garden Plots redevelopment program. Osler Drive/Access and West Street The access driveway in alignment with Osler Drive should provide one lane inbound and one lane outbound. West Street should provide a northbound left-turn lane, which can be striped from the existing cross-hatched center lane. A southbound right-turn lane on West Street is not required. The capacity analyses show that this intersection currently operates at an acceptable level of service. However, as noted, this intersection currently experiences some delay and queuing during the weekday evening peak hour due to heavy turning movements turning to/from Osler Drive. The capacity analyses show that this intersection will operate at an acceptable level of service as an unsignalized intersection with Osler Drive and the relocated Garden Plot Access driveway under stop sign control (West Street traffic remains a freeflow movement). As such, the intersection has sufficient capacity to accommodate the expected regional growth in traffic, as well as the additional traffic to be generated by the athletic fields. Other than the separate left-turn lane on West Street serving the access drive, no additional geometric or traffic control improvements are required in conjunction with the West Street Garden Plots redevelopment program. Naperville Park District Naperville, Illinois A-22

25 Emerald Drive and West Street The capacity analyses show that this intersection generally operates at an acceptable level of service. However, during the weekday evening peak hour, the intersection currently operates at a Level of Service E. Further, as noted, this intersection currently experiences some delay and queuing during the weekday evening peak hour. This intersection will continue to operate at the same levels of service for each of the respective peak hours analyzed with the additional regional growth in traffic and the expected traffic from the multi-purpose athletic fields. The low volume of additional traffic generated by the multi-purpose athletic fields will have a limited impact on the operation of this intersection. As such, no widening improvements or traffic control improvements are needed at this intersection to accommodate the proposed West Street Garden Plots redevelopment program. Sight-Distance Field observations have shown that West Street has a very level/flat vertical profile which indicates that the existing access driveways have sufficient sight distance to observe vehicles traveling along West Street. The traffic signal at Hillside Road and the all-way stop sign controlled intersection at Emerald Drive helps platoon the through traffic on West Street, providing sufficient gaps in the West Street traffic stream for vehicles to enter/exit the relocated southern access drive. This is evident in the results of the capacity analysis for projected conditions, which indicate the intersection of Osler Drive and West Street will operate at an acceptable level of service. Naperville Park District Naperville, Illinois A-23

26 Conclusion The West Street Garden Plots development proposes to provide two multi-purpose athletic fields and maintain 478 garden plots. Access to the overall site will be provided from the existing north access, the existing middle access (in alignment with the parking lot to Knoch Park), and the realignment of the southern access driveway opposite Osler Drive. Based on this study, the following is concluded with respect to the proposed West Street Garden Plot improvements: The proposed West Street Garden Plot improvements (which include the two proposed multi-purpose athletic fields) will have a limited traffic impact on the surrounding roadway network. This is due to the limited volume of additional traffic projected to be generated by the multi-purpose athletic fields, particularly during the weekday evening peak hour. The capacity analyses show that all of the intersections will continue to either operate at an acceptable level of service or the same level of service with the proposed West Street Garden Plots improvements. Further, the additional traffic generated by the proposed West Street Garden Plots improvements will have a limited impact on the operation of the various cross road approaches with West Street. The Year 2010 No-Build conditions (which assume no improvements are done to the existing garden plots) indicate that no improvements (i.e. no widening of the roadway) are required on West Street. Other than the improvements associated with the relocation of the southern access drive, no roadway widening improvements on West Street are required to accommodate the proposed West Street Garden Plots improvements, which include the addition of the two multi-purpose athletic fields. A northbound left-turn lane on West Street will be required to serve the relocated southern access driveway and can be provided within the existing striped median. The proposed 120-space surface parking lot meets the City s parking ordinance, which requires 35 parking spaces per athletic field. The residual 50 parking spaces are sufficient to accommodate parking turnover during game transitions. The traffic signal at Hillside Road and the all-way stop sign controlled intersection at Emerald Drive helps platoon the through traffic on West Street, providing sufficient gaps in the West Street traffic stream for vehicles to enter/exit the relocated southern access drive. This is evident in the results of the capacity analysis for projected conditions, which indicate the intersection of Osler Drive and West Street will operate at an acceptable level of service. Naperville Park District Naperville, Illinois A-24

27 Introduction Section B DuPage River Park Garden Plots Development This section of the report summarizes the methodologies, results and findings of a site traffic analysis conducted for the proposed DuPage River Park Garden Plots development to be located in the southeast quadrant of the intersection of Washington Street and Royce Road in Naperville, Illinois. Figure B-1 shows the location of the site in relation to the area roadway system. Figure B- 2 shows an aerial view of the site area. Per the direction of the City of Naperville, the following three intersections were analyzed as part of this study: 1. Washington Street and Royce Road 2. Royce Road and Apple River Lane 3. Royce Road and Fox River Lane The following sections of this report present the following: Existing roadway conditions, including traffic volumes for the weekday midday, weekday evening, and Saturday midday peak hours A detailed description of the proposed development Vehicle trip generation for proposed garden plots Directional distribution of development-generated traffic Regional ambient growth in traffic Traffic analyses conducted for the weekday midday and evening and Saturday midday peak hours for the following two conditions: 1. Existing Conditions - Analyzes the capacity of the existing roadway system using currently recorded traffic volumes in the surrounding area. 2. Projected Conditions (Year 2010) This condition includes the existing traffic volumes increased by a regional growth factor in addition to the traffic generated by the proposed DuPage River Park development. Future transportation conditions, including access to and from the site and planned roadway improvements. The purpose of this study was to examine the impact this proposed development would have on the surrounding roadway network in conjunction with regional growth for Year 2010 Projected traffic conditions. Naperville Park District Naperville, Illinois B-1

28 ^ North SITE Site Map Figure B-1 Naperville Park District Naperville, Illinois B-2

29 Aerial View Figure B-2 Naperville Park District Naperville, Illinois B-3

30 Existing Conditions Existing traffic and roadway conditions were documented based on field visits and traffic counts conducted by KLOA, Inc, as well as previously conducted traffic counts provided by the City of Naperville. The following provides a detailed description of the physical characteristics of the roadways including geometry and traffic control, adjacent land uses and peak hour traffic flows along area roadways. Description of Study Area The areas surrounding the site are primarily composed of residential neighborhoods and open green space. The River Sports Complex is located on the west side of Washington Street. Existing Roadway System Characteristics The characteristics of the existing roadways that surround the proposed development are illustrated in Figure B-3 and described below. Washington Street is a north-south arterial roadway providing two through lanes in each direction. At its signalized intersection with Royce Road, a left-turn lane, through lane, and a shared through/right-turn lane are provided on both the north and south approaches. The posted speed limit is 45 mph, and parking is prohibited on both sides of the roadway. Washington Street is under the jurisdiction of the City of Naperville. Royce Road is an east-west arterial roadway providing one travel lane in each direction and T- intersects Washington Street from the east. At its signalized intersection with Washington Street, a left-turn lane and shared through/right-turn lane are provided on both the east and west approaches. The west approach serves a parking lot for the River Sports Complex. An eastbound left-turn lane is provided at both its unsignalized intersections with Fox River Lane and Apple River Drive. The posted speed limit is 35 mph, and parking is prohibited on both sides of the roadway. Royce Road is under the jurisdiction of the City of Naperville. Apple River Drive is a north-south local residential roadway that T-intersects Royce Road from the north. At its approach with Royce Road, it is under stop sign control and provides a single lane to make left- or right-turn movements onto Royce Road. The posted speed limit is 25 mph and parking is permitted on both sides of the roadway. Apple River Drive is under the jurisdiction of the City of Naperville. Fox River Lane is a north-south local residential roadway that T-intersects Royce Road from the north. At its approach with Royce Road, it is under stop sign control and provides a single lane to make left- or right-turn movements onto Royce Road. The posted speed limit is 25 mph and parking is permitted on both sides of the roadway. Fox River Lane is under the jurisdiction of the City of Naperville. Naperville Park District Naperville, Illinois B-4

31 FO X RIVER LN 25 MPH APPLE RIVER DR NOT TO SCALE ROYCE RD 35 MPH WASHINGTON ST SITE 45 MPH LEGEND - TRAVEL LANE - TRAFFIC SIGNAL - STOP SIGN PROJECT: TITLE: PROJECT NO: DUPAGE RIVER PARK NAPERVILLE, ILLINOIS EXISTING ROADWAY CHARACTERISTICS FIGURE NO: B-3

32 Existing Traffic Volumes Manual turning movement traffic counts were conducted on a weekday midday between 11:00 A.M. and 4:00 P.M., and evening 4:00 P.M. and 7:00 P.M. periods and on a Saturday midday period between 10:00 A.M. and 4:00 P.M. at the following intersections: Royce Road and Fox River Lane Royce Road and Apple River Drive In addition, previous traffic counts conducted by the City of Naperville were provided for the intersection of Royce Road and Washington Street. From the manual turning movement count data, it was determined that the weekday midday peak hour occurs between 3:00 and 4:00 P.M., the weekday evening peak hour occurs between 5:00 and 6:00 P.M., and the Saturday midday period occurs between 2:00 and 3:00 P.M. Figure B-4 shows the existing peak hour traffic volumes at the respective intersections. Field observations during these traffic counts noted minimal pedestrian activity during these peak hour periods. Accident Data Accident data from January 1, 2005 through December 21, 2007 was provided by the City of Naperville for the various intersections in the study area. The following summarizes the accident data. The intersection of Washington Street with Royce Road experienced a total of 45 accidents in the three year period. The intersection of Royce Road and Fox Rive Lane experienced a total of three accidents in the three year period. The intersection of Royce Road and Apple River Road experienced a total of two accidents in the three year period. Naperville Park District Naperville, Illinois B-6

33 15 (30) [20] 1070 (1490) [1055] 95 (135) [105] 15 (10) [25] 5 (5) [10] 5 (10) [15] 120 (290) [100] 5 (10) [10] 270 (505) [250] 10 (25) [10] 1000 (1150) [1010] 195 (250) [245] FO X 5 (15) [15] RIVER 5 (5) [5] 5 (20) [25] 290 (370) [335] LN 5 (15) [5] 390 (790) [345] 15 (15) [5] 10 (10) [15] 15 (15) [20] 280 (360) [320] APPLE RIVER DR 10 (20) [10] 385 (795) [335] NOT TO SCALE ROYCE RD WASHINGTON ST SITE LEGEND 00 (00) [00] - WEEKDAY MIDDAY PEAK HOUR - WEEKDAY PM PEAK HOUR - SATURDAY MIDDAY PEAK HOUR PROJECT: TITLE: PROJECT NO: DUPAGE RIVER PARK NAPERVILLE, ILLINOIS EXISTING TRAFFIC VOLUMES FIGURE NO: B-4

34 Traffic Characteristics of the DuPage River Park Development To evaluate the impact of the subject development on the area roadway system, it was necessary to quantify the number of vehicle trips the site will generate during the weekday midday, evening, and Saturday midday peak hours and then determine the directions from which this traffic will approach and depart the site. Proposed DuPage River Park Development The development is proposed to be located in the southeast quadrant of the intersection of Washington Street and Royce Road in Naperville, Illinois. The development proposes 332 garden plots and a Park District maintenance driveway. In addition, a ten-foot wide multi-use trail is planned to traverse through the site. Site Access The current site plan shows a proposed full access driveway in alignment with Apple River Drive, becoming the fourth/south leg to the existing T-intersection on Royce Road. It is our understanding that a second access driveway, restricted to right-in/right-out only turning movements is planned for the west end of the development, located between Fox River Lane and Apple River Drive on Royce Road. For the purposes of this study, and to provide for a conservative analysis, all site-generated traffic was assigned to the full access proposed at Apple River Drive. The garden plots are used primarily in late Spring through early Fall (growing season) and are typically accessible from dawn to dusk, seven days a week. Based on a survey conducted in November 2008 by the Naperville Park District, approximately 83% of the respondents indicated that they travel to/from existing garden plots by automobile, and that 64% of the respondents maintain only one garden plot. Therefore, minimal pedestrian activity is expected to traverse Royce Road to access this garden plot development. Directional Distribution of Site Traffic The directional distribution of how traffic will approach and depart the site was estimated based on existing travel patterns in the area, as well as the direction and proximity of established residential neighborhoods that may use the garden plots. The anticipated directional distribution is tabulated in Table B-1 and illustrated in Figure B-5. Naperville Park District Naperville, Illinois B-8

35 50% FO X -% RIVER LN 10% APPLE RIVER DR NOT TO SCALE ROYCE RD 20% WASHINGTON ST SITE 20% LEGEND 00% - - PERCENTAGE DISTRIBUTION - LESS THAN 5 PERCENT PROJECT: TITLE: PROJECT NO: DUPAGE RIVER PARK NAPERVILLE, ILLINOIS ESTIMATED DIRECTIONAL DISTRIBUTION FIGURE NO: B-5

36 Table B-1 DIRECTIONAL DISTRIBUTION OF SITE-GENERATED TRAFFIC Direction To/From Percentage Distribution North on Washington Street 50% South on Washington Street 20% East on Royce Road 20% North on Apple River Drive 10% Total: 100% Site Traffic Generation Using information provided by the Naperville Park District, trip generation estimates were developed for the weekday midday, evening, and Saturday midday peak hour periods during peak growing season for 332 garden plots. The trip estimates are based on the planting season which represents the peak activity at the garden plots. These trip estimates are tabulated in Table B-2. Table B-2 ESTIMATED DUPAGE RIVER PARK GARDEN PLOTS TRAFFIC VOLUMES (PEAK GROWING SEASON) Peak Hour Period In Out Total Weekday Midday Weekday Evening Saturday Midday As shown in Table B-2, this development generates a low volume of traffic during each of the three studied peak hours. The Saturday midday peak hour is estimated to generate the highest volume of traffic with an expected 60 two-way vehicle trips. Site Traffic Assignment The peak hour traffic volumes projected to be generated by the 332 garden plots (refer to Table B-2) were assigned to the area roadways based on the directional distribution analysis (Figure B- 5). Figure B-6 shows the assignment of the site-generated peak hour traffic volumes. Naperville Park District Naperville, Illinois B-10

37 2 (3) [6] 1 (2) [3] 7 (10) [21] 5 (7) [15] FO X RIVER LN 1 (2) [3] APPLE RIVER DR 2 (3) [6] NOT TO SCALE ROYCE RD 5 (7) [15] 2 (3) [6] 7 (10) [21] 7 (10) [21] 7 (10) [21] 2 (3) [6] WASHINGTON ST SITE LEGEND 00 (00) [00] - WEEKDAY MIDDAY PEAK HOUR - WEEKDAY PM PEAK HOUR - SATURDAY MIDDAY PEAK HOUR PROJECT: TITLE: PROJECT NO: DUPAGE RIVER PARK NAPERVILLE, ILLINOIS ESTIMATED SITE-GENERATED TRAFFIC VOLUMES FIGURE NO: B-6

38 Regional Traffic Growth The existing traffic volumes (Figure B-4) were increased by an overall regional growth factor of three percent. It should be noted that a one to one and a half percent per year regional growth factor is typical for this area. However, a greater growth factor was used to account for the previously recorded traffic volumes that were conducted in Year 2008 at the signalized intersection of Washington Street and Royce Road. Year 2010 Total Traffic Volumes The Year 2010 Total Traffic condition includes the existing traffic volumes increased by the regional growth factor of three percent, as well as the traffic generated by the proposed 332 garden plots during peak growing season. Figure B-7 shows the estimated Year 2010 total traffic volumes. Traffic Evaluation The following provides an evaluation conducted for the weekday midday, weekday evening, and Saturday midday peak hour periods. The evaluation includes conducting capacity analyses to provide an indication of how well the existing roadway infrastructure accommodates the existing traffic volumes, as well as the anticipated traffic demands placed upon them for Year 2010 Total Traffic conditions. Traffic Analyses Roadway and adjacent or nearby intersection analyses were performed for the three peak hour periods for existing conditions and Year 2010 total traffic conditions. The traffic analyses were performed using the methodologies outlined in the Transportation Research Board s Highway Capacity Manual (HCM), Synchro 6.0/SimTraffic software was used to perform the calculations. The analyses for the existing traffic-signal controlled intersection (Washington Street and Royce Road) were accomplished using the existing signal phasings and cycle lengths to determine the average overall vehicle delay, volume-to-capacity ratios, and levels of service. Naperville Park District Naperville, Illinois B-12