CEE 320 Final Examination (2 hours)

Transcription

1 CEE 320 Final Examination (2 hours) Please write your name on this cover. Please write you last name on all other exam pages This examination is open-book, open-note. There is a group work evaluation on page 2, which you must fill out. There are 7 questions worth a total of 200 points. Each question lists the point value for that question. Please work quietly and respect other people s space. Carefully read each question and ensure that you answer what is asked. If you need additional workspace, use the back of the page or the blank page included at the end of the examination. If you need to unstaple pages, I have a stapler to restaple them at the end of the examination. Name (first, last): 1

2 Group Work Evaluation This is your opportunity to evaluate your group for Projects 1 and 2. You have 100 points to assign to the group. Please write the last name of each group member and distribute these 100 points to your group members, including yourself, in accordance with their contribution to the group. This will be used as a weighting factor in your homework grades. Group Member Name Points Assigned Total =100 Group 1 Group 2 Group 3 Group 4 Chris Dela Pena Ryan Frostad Rachel Curtin Brian Flaherty Matt Motland Kylan Kegel Richard Proszek Kyle Young Sean Doherty Yanis Nora Alex Nightengale David Roman-Sanchez Nathan Schmaus Ben Enfield David Baggott Michael Russell Group 5 Group 6 Group 7 Group 8 Perry Welch Erin Mika Lisa Erickson William Bruns Josh Nelson April Pust Mandana Ashti Brynn Carr Flint Jackson Kendra Hartstrom Fred McDonald Charles Grove Sean Miyashiro Christina Strand Eric Reynolds Group 9 Group 10 Tiran Zhang June Inoue Owen Sullivan Gregory Frost Jeremy Chin Brett Fuller Cecilia Guess Kris McArthur 2

3 Question 1: Short Answers (5 points each, 35 points total) Using basic traffic stream models, if the jam density of a particular roadway is 250 vehicles/mile, what is the density at capacity? What large transportation system was analyzed by Daniel McFadden s team as the original test of his discreet choice modeling system? If a highway performance function (HPF) assigns traffic to a route that results in LOS F, is the HPF travel time prediction still valid? Why or why not? (1-3 sentences should suffice). What speed estimation parameter (g) should be used if you are trying to estimate speed using a single loop detector (6 ft long) for a 40 ft long bus? 3

4 What is the most popular type of traffic detector at new ATMS sites today? Give 3 examples of intelligent transportation systems (ITS) used by the Washington State Department of Transportation. Given the following traffic counts, what is the peak hour factor for 4:00pm to 5:00pm? Time Period Volume (vehicles) 4:00 4: :15 4: :30 4: :45 5: (Extra credit) In addition to a 2003 Honda Element, what other vehicle does Steve drive? Honda Civic Hybrid Nissan Pathfinder Ford Ranger Scion xa Subaru Forester 4

5 Problem 2 (30 points) A Jiffy-lube owner wants to build a new store in Lynnwood, WA. This store will have two service bays and one driveway with a centerline length of 80 ft. Customers must wait in line for the next available bay in this driveway. The city of Lynnwood wants to know the probability that there will be enough waiting customers such that the line will back up onto the arterial during the peak hour of business? Use M/M/N queuing analysis. On average, a waiting vehicle takes up 20 ft of centerline driveway length. Each vehicle spends an average of 10 minutes in the service bay. Peak hour arrival rate is 5 vehicles/hour. Driveway Length = 80 ft Service Bay Arterial 5

6 Problem 3 (30 points) At milepost near Cle Elum, the westbound direction of the I-90 has the following characteristics: Rural freeway classification PHF = 0.97 No HOV lanes 12 ft lane width 10 ft right-side shoulders 4 lanes total (2 in each direction) 0.67 interchanges per mile 2% recreational vehicles 2.11% upgrade for 0.84 miles Driver population adjustment factor = 1.0 % trucks: use data from the B04 ADC according to the WSDOT Annual Traffic Report (see next page) Volume: use highest volume of 2004 at the B04 ADC according to the WSDOT Peak Hour Report (see page after next) Find and report the following: 1. Free flow speed for this section of freeway (to the nearest mile per hour). 2. The 15-minute passenger-car equivalent flow rate (v p in pcplph). 3. The freeway section level of service (LOS). 6

7 Page 112 from the WSDOT 2004 Annual Traffic Report 7

8 Page 13 from the WSDOT 2004 Peak Hour Report 8

9 Problem 4 (30 points) Assume the logit model shown below describes route choice for 10,000 vehicles in the SR 520 and I-90 bridges if a toll system were to be installed on the SR 520 bridge. What toll should WSDOT charge (to the nearest cent) so that the resulting traffic distribution from these 10,000 vehicles results in 3,500 vehicles selecting the SR 520 route? Variable Coefficient Profile values SR 520 Route Constant Distance from residence to nearest on ramp (miles) Toll (in dollars) -0.3??? Flexibility of work arrival time (1 if flexible, 0 if not) Income (in thousands of dollars) I-90 Route Distance from residence to nearest on ramp (miles) Income (in thousands of dollars) Work on the south end of Seattle (1 if yes, 0 if no)

10 Problem 5 (25 points) Projected yearly Link Light Rail trips from the University of Washington stop to SeaTac Airport are modeled using a Poisson regression model described below. Using this model, report the following: 1. The average number of yearly light rail trips from UW to SeaTac for this person. 2. The probability that no UW-SeaTac trips will be made over a 4-month span. Variable Coefficient Profile Constant Income Transportation faculty indicator (1 = yes, 0 = no) Cost of daily parking at SeaTac (dollars) Cost of daily parking on campus (dollars) Number of cars owned UW employee? (yes = 1, no = 0) Number of kids Link Light Rail fare (in dollars)

11 CEE 320 Final Name: Problem 6 (25 points) A 2-lane (12 ft wide lanes) combined horizontal and crest vertical curve is reportedly designed for 35 mph. Both curves begin at point A and end at point B. Given the data below, is this section of roadway adequately designed for 35 mph? Show appropriate calculations to support your conclusion. A Horizontal Curve Data Curve length = 390 ft 60 angle as shown 4% superelevation M s = 25 ft (perpendicular distance from centerline of inside lane to nearest obstruction) Vertical Curve Data Curve length = 390 ft G 1 = 6% G 2 = -3.5% G 1 G 2 A B 60 B Plan View Profile View 11

12 CEE 320 Final Name: Problem 7 (25 points) You are designing the vertical alignment of Strander Blvd. extension in the Renton- Tukwila area. An equal tangent sag vertical curve must go under an existing north-south rail line. The centerline roadway surface must be at least 18 ft below the proposed rail bridge. Known grades, stationing and elevations are given in the drawing below. Design the curve for the highest possible design speed without violating the 18 ft clearance requirement. Report the longest possible curve length and the associated design speed rounded down to the nearest 5 mph. (now where do I remember seeing a problem like this before?) Railroad bridge Station of far right side = Profile View Not to scale Elevation = 137 ft 18 ft minimum PVC G 2 = +4.5% G 1 = -3.0% PVI Station = Elevation = 107 ft PVT 12

13 CEE 320 Final Name: Blank Page for Additional Work Space 13

14 CEE 320 Final Name: Minimum Radius Using Limiting Values of e and f s Replaces Table 3.5 in the book US Customary Design Calculated Rounded Speed Maximum Maximum Total Radius Radius (mph) e (%) f s (e/100 + f s ) R v (ft) R v (ft) , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,370 To solve a quadratic equation (in case you forgot) Where: ax 2 + bx + c = 0 The solution is: x = b ± b 2 4ac 2a 14