Speed Limit and Safety Nexus Studies for Automated Enforcement Locations in the District of Columbia 22 Block South Dakota Avenue NE Study Area and Location District PSA Ward ANC Phase Description 5 53 5 5B Existing 22 Block South Dakota Avenue Northeast Southeast bound Recreational Center KEY: Existing Camera Proposed Camera Bus Stop Metro Station Hiker/Biker Trail School Other Pedestrian Generator Site 48 The existing speed camera is located in Ward 5 on the 22 Block South Dakota Avenue Northeast in the southeast-bound direction. South Dakota Avenue Northeast runs from Riggs Road Northeast to the north and New York Avenue Northeast to the south. The posted speed limit is 25 MPH. The speed camera was installed on June 212. W5-24 District Department of Transportation 55 M Street SE, Suite 4 Washington, DC 23
22 Block South Dakota Avenue NE Field Assessment Summary South Dakota Avenue Northeast is assumed to run in the North-South direction and is classified as a principal arterial. South Dakota Avenue has two travel lanes in each direction. This site has the following characteristics: The roadway pavement is in good condition and has curb and gutter drainage features. There is sidewalk along the north side of the roadway. There is a curbed median that has grass in the middle. There are a few bus stops in the area that generate pedestrian activity. The Dakota Playground is near the site and generates pedestrian and bicycle activity. Looking North W5-25 District Department of Transportation 55 M Street, SE, Suite 4 Washington, DC 23
22 Block South Dakota Avenue NE Looking South Speed Data Analysis Posted Speed Limit (MPH) 25 Mean Speed (MPH) 19 85th Percentile Speed (MPH) 27 1 MPH Pace Speed (MPH) 14-23 ADT 14,581 The mean speed is 6 MPH lower than the posted speed limit and the 85 th percentile speed is 2 MPH higher than the posted speed limit. Crash Data Analysis From the Accident Summary Report provided for the dates between January 1, 21 and December 31, 212, there were a total of 33 crashes at this location. A breakdown of number of crashes by collision type can be found in the chart on the next page. The most common types of collision at this location were Rear End (15 crashes) and Left Turn (7 crashes). The other collision types had four crashes or less. Furthermore, this location experienced a high frequency (16 crashes) of injury-related crashes. W5-26 District Department of Transportation 55 M Street, SE, Suite 4 Washington, DC 23
22 Block South Dakota Avenue NE Severity Weather Surface condition Light Condition Total 33 Fatal Clear 28 84.8% Dry 26 78.8% Day 18 54.5% Injury 16 48.5% Rain 4 12.1% Wet 5 15.2% Night 14 42.4% Truck 4 12.1% Fog/Mist Snow/Ice Taxi 16 Number of Crashes by Collision Type 14 12 Rear End Number of Crashes 1 8 6 4 2 Right Angle Left Turn Side Swipe Collision Type Fixed Object Backing Unspecified There were an elevated number of speed-related crashes at this location, including rear end crashes. The AASHTO Highway Safety Manual lists assuming the lead driver will go through a green or yellow light, but the lead driver stops and changing lanes to avoid a slowing or stopped vehicle 1 as two errors leading to rearend crashes. Both of these errors can be decreased with a decrease in travel speed. The speed camera was installed on 6-4-212. The graph on the next page shows the number of crashes in the three years prior to the speed camera s installation (29 crashes) and one year after the speed camera s installation (15 crashes). Overall, there was a slight increase in, but no major change seen in the number of crashes after the installation of this camera. 1 AASHTO Highway Safety Manual, 1 st Edition, 21; Volume 1, page 2-13 W5-27 District Department of Transportation 55 M Street, SE, Suite 4 Washington, DC 23
22 Block South Dakota Avenue NE 16 # Crashes by Year 15 14 12 1 8 6 4 2 12 12 5 6/4/29-6/4/21 6/4/21-6/4/211 6/4/211-6/4/212 6/4/212-6/4/213 Speed Camera Installed on 6/4/212 Safety Nexus This site presents the following safety considerations which may establish a nexus between the speed camera and traffic safety. 1. Speed Data The 85 th percentile speed is higher than the posted speed limit at this location. 2. Crash Data The location experienced a high frequency (16 crashes) of injury related crashes, as well as an elevated number of speed-related crashes at this location, including rear end crashes. 3. Field Assessment The following site characteristics suggest a need for a safer travel environment: a. Dakota Playground is in the area which generates pedestrian and bicycle activity. b. There are two bus stops in the area which generate pedestrian activity. Due to the speed data analysis, the elevated number of speed-related crashes and injury-related crashes, the specific site characteristics and pedestrian generators, there is a nexus between traffic safety and the speed camera at this location. W5-28 District Department of Transportation 55 M Street, SE, Suite 4 Washington, DC 23
SAMMAT ENGINEERING SERVICES, LLC 1515 RISING RIDGE ROAD MOUNT AIRY, MD 21771 22 Block of South Dakota Ave. NE SEB Speed www.sammateng.com SEB Start 1 36 41 46 51 56 61 66 71 76 81 86 91 96 Time 35 4 45 5 55 6 65 7 75 8 85 9 95 999 Total 11/11/13 * * * * * * * * * * * * * * * 1: * * * * * * * * * * * * * * * 2: * * * * * * * * * * * * * * * 3: * * * * * * * * * * * * * * * 4: * * * * * * * * * * * * * * * 5: * * * * * * * * * * * * * * * 6: * * * * * * * * * * * * * * * 7: * * * * * * * * * * * * * * * 8: * * * * * * * * * * * * * * * 9: * * * * * * * * * * * * * * * 1: * * * * * * * * * * * * * * * 11: * * * * * * * * * * * * * * * 12 PM * * * * * * * * * * * * * * * 13: * * * * * * * * * * * * * * * 14: * * * * * * * * * * * * * * * 15: * * * * * * * * * * * * * * * 16: * * * * * * * * * * * * * * * 17: * * * * * * * * * * * * * * * 18: * * * * * * * * * * * * * * * 19: * * * * * * * * * * * * * * * 2: * * * * * * * * * * * * * * * 21: * * * * * * * * * * * * * * * 22: * * * * * * * * * * * * * * * 23: 36 3 39 Total 36 3 39 W5-29
SAMMAT ENGINEERING SERVICES, LLC 1515 RISING RIDGE ROAD MOUNT AIRY, MD 21771 22 Block of South Dakota Ave. NE SEB Speed www.sammateng.com SEB Start 1 36 41 46 51 56 61 66 71 76 81 86 91 96 Time 35 4 45 5 55 6 65 7 75 8 85 9 95 999 Total 11/12/13 9 8 7 1 1 1 18 1: 68 6 3 1 78 2: 54 4 2 6 3: 79 7 2 2 2 92 4: 179 35 13 2 1 23 5: 372 48 16 3 1 1 441 6: 688 51 7 4 1 751 7: 846 31 6 3 886 8: 788 3 8 826 9: 813 14 2 829 1: 82 25 2 1 848 11: 924 25 5 954 12 PM 933 16 2 951 13: 989 8 1 998 14: 189 2 4 1113 15: 752 5 1 1 759 16: 715 3 718 17: 722 3 725 18: 878 4 4 886 19: 73 1 1 741 2: 626 14 2 2 1 645 21: 452 16 2 47 22: 351 17 4 372 23: 57 1 58 Total 1415 41 93 2 8 1 1 14539 Grand Total 1451 44 93 2 8 1 1 14578 15th Percentile : 5th Percentile : 85th Percentile : 95th Percentile : 9 MPH 18 MPH 27 MPH 32 MPH Stats Mean Speed(Average) : 19 MPH 1 MPH Pace Speed : 14-23 MPH Number in Pace : 6549 Percent in Pace : 44.9% Number of Vehicles > 25 MPH : 3479 Percent of Vehicles > 25 MPH : 23.9% W5-3
SAMMAT ENGINEERING SERVICES, LLC 1515 RISING RIDGE ROAD MOUNT AIRY, MD 21771 www.sammateng.com 22 Block of South Dakota Ave. NE SEB Volume S ta rt M o n 11-Nov- T u e 12-Nov- W e d 13-Nov- D a ily A ve rage T im e A.M. P.M. A.M. P.M. A.M. P.M. A.M. P.M. 12: * * 29 244 * * 29 244 12:15 * * 3 232 * * 3 232 12:3 * * 29 246 * * 29 246 12:45 * * 2 229 * * 2 229 1: * * 2 245 * * 2 245 1:15 * * 16 223 * * 16 223 1:3 * * 2 246 * * 2 246 1:45 * * 22 284 * * 22 284 2: * * 12 264 * * 12 264 2:15 * * 18 297 * * 18 297 2:3 * * 1 25 * * 1 25 2:45 * * 2 32 * * 2 32 3: * * 16 269 * * 16 269 3:15 * * 21 227 * * 21 227 3:3 * * 23 11 * * 23 11 3:45 * * 32 153 * * 32 153 4: * * 33 12 * * 33 12 4:15 * * 56 177 * * 56 177 4:3 * * 61 22 * * 61 22 4:45 * * 8 21 * * 8 21 5: * * 89 137 * * 89 137 5:15 * * 121 127 * * 121 127 5:3 * * 98 194 * * 98 194 5:45 * * 133 267 * * 133 267 6: * * 16 239 * * 16 239 6:15 * * 182 218 * * 182 218 6:3 * * 183 215 * * 183 215 6:45 * * 226 214 * * 226 214 7: * * 241 223 * * 241 223 7:15 * * 244 29 * * 244 29 7:3 * * 26 155 * * 26 155 7:45 * * 195 154 * * 195 154 8: * * 223 183 * * 223 183 8:15 * * 211 189 * * 211 189 8:3 * * 2 147 * * 2 147 8:45 * * 192 126 * * 192 126 9: * * 196 147 * * 196 147 9:15 * * 211 131 * * 211 131 9:3 * * 25 97 * * 25 97 9:45 * * 217 95 * * 217 95 1: * * 26 88 * * 26 88 1:15 * * 215 13 * * 215 13 1:3 * * 26 92 * * 26 92 1:45 * * 221 89 * * 221 89 11: * * 21 61 * * 21 61 11:15 * * 251 * * 251 11:3 * 248 * * 248 11:45 * 39 254 * * * 254 39 Total 39 613 8439 613 8478 Combined Total 39 14542 14581 Peak - - - 11: 2:15 - - - - 11: 2:15 Vol. - - - 954 1118 - - - - 954 1118 P.H.F..939.925.939.925 ADT ADT 14,581 AADT 14,581 W5-31
DC Department of Transportation - Traffic Accident Reporting and Analysis System Accident Summary Report (R-8) Corridor: SOUTH DAKOTA AVE,NE From THIRTY THIRD ST,NE TO THIRTY THIRD PL,NE Time Period Covered: From 1/1/21 To 12/31/212 Prepared By: Rahul Jain Prepared Date: 9/15/213 Total Number of Accident: Total Number of Fatalities: Total Number of Injuries: Total Number of Disabling Injuries: Total Number of NonDisabling Injuries: Total Number of Pedestrians Involved: Total Number of Bicycles Involved: Total Number of Motorcycles Involved: 33 26 1 Collision Type #ACC % Collision Type #ACC % Right Angle: 4 12.1% Fixed Object: 2 6.1% Left Turn: 7 21.2% Ran Off Road: Right Turn: Ped. Involved: Rear End: 15 45.5% Backing: 1 3.% Side Swiped: 1 3.% Non Collision: Head On: Under/Over Ride: Parked: Unspecified: 3 9.1% Time of Day #ACC % 7:3 ~ 9:3: 3 9.1% 9:3 ~ 11:3: 7 21.2% 11:3 ~ 13:3: 3 9.1% 13:3 ~ 16:: 3 9.1% 16: ~18:3: 1 3.% 18:3 ~ 7:3: 16 48.5% Unspecified: Day o fweek #ACC % Sunday: 4 12.1% Monday: 7 21.2% Tuesday: Wednesday: 5 15.2% Thursday: 4 12.1% Friday: 5 15.2% Saturday: 8 24.2% Weather Condition #ACC % Clear: 28 84.8% Rain: 4 12.1% Snow: Sleet/Hail: Fog/Mist: Crosswind/Blowing Sand: 3.% Surface Condition #ACC % Dry: 26 78.8% Wet: 5 15.2% Snow/Ice: Slush: Water/Sand: Repairing: Unspecified: 2 6.1% Type of Vehicle #VEH % Passenger Car: 56 9.3% Bus: Truck: 4 6.5% Taxi: Minivan: Police/Emergency Vehicle: Motorcycle/Moped: Bicycle: Fixed Object: Unspecified: 2 3.2% Accident Severity Type #ACC % Fatal Collision: Injury Collision: 16 48.5% PDO Collision: 17 51.5% Light Condition #ACC % Daylight: 18 54.5% Dawn/Dusk: Dark(Lighted): 13 39.4% Dark(Not Lighted): 1 3.% Dark(Unknown Lighting): 3.% Contributing Factor #VEH % Driver: Speed: 1 1.6% Driver: Alcohol/Drug: 1 1.6% Driver: Electronic Device: Driver: Others: 8 12.9% Vehicle: Roadway: 1 1.6% Unspecified: 51 82.3% Pedestrian Actions #ACC % In Crosswalk with Signal: In Crosswalk against Signal: In Crosswalk no Signal: In Unmarked Crosswalk: Not in Crosswalk: From Between Parked Cars: Unspecified: 2 Records are not approved as of 9/15/213 2:3:41 PM W5-32
DC Department of Transportation - Traffic Accident Reporting and Analysis System Corridor: Time Period Covered: Accident Summary Report (R-8) SOUTH DAKOTA AVE,NE From THIRTY THIRD PL,NE TO THIRTY THIRD ST,NE Total Number of Accident: Total Number of Fatalities: Total Number of Injuries: Total Number of Disabling Injuries: Total Number of NonDisabling Injuries: Total Number of Pedestrians Involved: Total Number of Bicycles Involved: Total Number of Motorcycles Involved: From 6/3/29 To 6/3/21 12 7 1 Prepared By: Rahul Jain Prepared Date: 11/18/21 3 Collision Type #ACC % Collision Type #ACC % Right Angle: 2 Fixed Object: 1 Left Turn: 2 Ran Off Road: Right Turn: Ped. Involved: Rear End: 6 5 Backing: Side Swiped: 1 Non Collision: Head On: Under/Over Ride: Parked: Unspecified: Time of Day #ACC % 7:3 ~ 9:3: 2 9:3 ~ 11:3: 1 11:3 ~ 13:3: 13:3 ~ 16:: 4 33.3% 16: ~18:3: 2 18:3 ~ 7:3: 3 25.% Unspecified: Day o fweek #ACC % Sunday: 2 Monday: 3 25.% Tuesday: 2 Wednesday: 2 Thursday: 2 Friday: Saturday: 1 Weather Condition #ACC % Clear: 11 91.7% Rain: 1 Snow: Sleet/Hail: Fog/Mist: Crosswind/Blowing Sand: Unspecified: Surface Condition #ACC % Dry: 1 83.3% Wet: 1 Snow/Ice: Slush: Water/Sand: Repairing: Type of Vehicle #VEH % Passenger Car: 23 92.% Bus: Truck: 2 8.% Taxi: Minivan: Police/Emergency Vehicle: Motorcycle/Moped: Bicycle: Fixed Object: Unspecified: Accident Severity Type #ACC % Fatal Collision: Injury Collision: 4 33.3% PDO Collision: 8 66.7% Light Condition #ACC % Daylight: 9 75.% Dawn/Dusk: Dark(Lighted): 3 25.% Dark(Not Lighted): Dark(Unknown Lighting): Unspecified: Contributing Factor #VEH % Driver: Speed: 1 4.% Driver: Alcohol/Drug: 1 4.% Driver: Electronic Device: Driver: Others: 2 8.% Vehicle: Roadway: 1 4.% Unspecified: 2 8 Pedestrian Actions #ACC % In Crosswalk with Signal: In Crosswalk against Signal: In Crosswalk no Signal: In Unmarked Crosswalk: Not in Crosswalk: From Between Parked Cars: Unspecified: 5 Records are not approved as of 11/18/213 1:2:46 AM W5-33
DC Department of Transportation - Traffic Accident Reporting and Analysis System Corridor: Time Period Covered: Accident Summary Report (R-8) SOUTH DAKOTA AVE,NE From THIRTY THIRD PL,NE TO THIRTY THIRD ST,NE Total Number of Accident: Total Number of Fatalities: Total Number of Injuries: Total Number of Disabling Injuries: Total Number of NonDisabling Injuries: Total Number of Pedestrians Involved: Total Number of Bicycles Involved: Total Number of Motorcycles Involved: From 6/3/21 To 6/3/211 5 6 Prepared By: Rahul Jain Prepared Date: 11/18/21 3 Collision Type #ACC % Collision Type #ACC % Right Angle: 1 2 Fixed Object: Left Turn: 2 4 Ran Off Road: Right Turn: Ped. Involved: Rear End: 2 4 Backing: Side Swiped: Non Collision: Head On: Under/Over Ride: Parked: Unspecified: Time of Day #ACC % 7:3 ~ 9:3: 9:3 ~ 11:3: 2 4 11:3 ~ 13:3: 1 2 13:3 ~ 16:: 16: ~18:3: 18:3 ~ 7:3: 2 4 Unspecified: Day o fweek #ACC % Sunday: 2 4 Monday: Tuesday: Wednesday: 1 2 Thursday: Friday: 2 4 Saturday: Weather Condition #ACC % Clear: 5 1 Rain: Snow: Sleet/Hail: Fog/Mist: Crosswind/Blowing Sand: Unspecified: Surface Condition #ACC % Dry: 5 1 Wet: Snow/Ice: Slush: Water/Sand: Repairing: Unspecified: Type of Vehicle #VEH % Passenger Car: 9 9 Bus: Truck: 1 1 Taxi: Minivan: Police/Emergency Vehicle: Motorcycle/Moped: Bicycle: Fixed Object: Unspecified: Accident Severity Type #ACC % Fatal Collision: Injury Collision: 3 6 PDO Collision: 2 4 Light Condition #ACC % Daylight: 3 6 Dawn/Dusk: Dark(Lighted): 2 4 Dark(Not Lighted): Dark(Unknown Lighting): Unspecified: Contributing Factor #VEH % Driver: Speed: Driver: Alcohol/Drug: Driver: Electronic Device: Driver: Others: 2 2 Vehicle: Roadway: 1 1 Unspecified: 7 7 Pedestrian Actions #ACC % In Crosswalk with Signal: In Crosswalk against Signal: In Crosswalk no Signal: In Unmarked Crosswalk: Not in Crosswalk: From Between Parked Cars: Unspecified: 1 Records are not approved as of 11/18/213 1:19:58 AM W5-34
DC Department of Transportation - Traffic Accident Reporting and Analysis System Corridor: Time Period Covered: Accident Summary Report (R-8) SOUTH DAKOTA AVE,NE From THIRTY THIRD PL,NE TO THIRTY THIRD ST,NE Total Number of Accident: Total Number of Fatalities: Total Number of Injuries: Total Number of Disabling Injuries: Total Number of NonDisabling Injuries: Total Number of Pedestrians Involved: Total Number of Bicycles Involved: Total Number of Motorcycles Involved: From 6/3/211 To 6/3/212 12 9 Prepared By: Rahul Jain Prepared Date: 11/18/21 3 Collision Type #ACC % Collision Type #ACC % Right Angle: 3 25.% Fixed Object: 1 Left Turn: 2 Ran Off Road: Right Turn: Ped. Involved: Rear End: 4 33.3% Backing: 1 Side Swiped: Non Collision: Head On: Under/Over Ride: Parked: Time of Day #ACC % 7:3 ~ 9:3: 2 9:3 ~ 11:3: 2 11:3 ~ 13:3: 1 13:3 ~ 16:: 1 16: ~18:3: 1 18:3 ~ 7:3: 5 41.7% Unspecified: Day o fweek #ACC % Sunday: 1 Monday: 3 25.% Tuesday: Wednesday: 2 Thursday: 3 25.% Friday: Saturday: 3 25.% Weather Condition #ACC % Clear: 8 66.7% Rain: 3 25.% Snow: Sleet/Hail: Fog/Mist: Crosswind/Blowing Sand: Surface Condition #ACC % Dry: 7 5 Wet: 4 33.3% Snow/Ice: Slush: Water/Sand: Repairing: Type of Vehicle #VEH % Passenger Car: 19 82.6% Bus: Truck: 2 8.7% Taxi: Minivan: Police/Emergency Vehicle: Motorcycle/Moped: Bicycle: Fixed Object: Unspecified: 2 8.7% Accident Severity Type #ACC % Fatal Collision: Injury Collision: 5 41.7% PDO Collision: 7 5 Light Condition #ACC % Daylight: 7 5 Dawn/Dusk: Dark(Lighted): 4 33.3% Dark(Not Lighted): Dark(Unknown Lighting): Contributing Factor #VEH % Driver: Speed: Driver: Alcohol/Drug: Driver: Electronic Device: Driver: Others: 3 13.% Vehicle: Roadway: Unspecified: 2 87.% Pedestrian Actions #ACC % In Crosswalk with Signal: In Crosswalk against Signal: In Crosswalk no Signal: In Unmarked Crosswalk: Not in Crosswalk: From Between Parked Cars: Unspecified: 9 Records are not approved as of 11/18/213 1:18:37 AM W5-35
DC Department of Transportation - Traffic Accident Reporting and Analysis System Corridor: Time Period Covered: Accident Summary Report (R-8) SOUTH DAKOTA AVE,NE From THIRTY THIRD PL,NE TO THIRTY THIRD ST,NE Total Number of Accident: Total Number of Fatalities: Total Number of Injuries: Total Number of Disabling Injuries: Total Number of NonDisabling Injuries: Total Number of Pedestrians Involved: Total Number of Bicycles Involved: Total Number of Motorcycles Involved: From 6/4/212 To 6/4/213 15 9 Prepared By: Rahul Jain Prepared Date: 11/18/21 3 Collision Type #ACC % Collision Type #ACC % Right Angle: Fixed Object: Left Turn: 3 2 Ran Off Road: Right Turn: Ped. Involved: Rear End: 8 53.3% Backing: Side Swiped: 2 13.3% Non Collision: Head On: Under/Over Ride: Parked: Unspecified: 2 13.3% Time of Day #ACC % 7:3 ~ 9:3: 9:3 ~ 11:3: 2 13.3% 11:3 ~ 13:3: 1 6.7% 13:3 ~ 16:: 2 13.3% 16: ~18:3: 1 6.7% 18:3 ~ 7:3: 9 6 Unspecified: Day o fweek #ACC % Sunday: 1 6.7% Monday: 2 13.3% Tuesday: Wednesday: 2 13.3% Thursday: 2 13.3% Friday: 3 2 Saturday: 5 33.3% Weather Condition #ACC % Clear: 13 86.7% Rain: 1 6.7% Snow: Sleet/Hail: Fog/Mist: Crosswind/Blowing Sand: 6.7% Surface Condition #ACC % Dry: 13 86.7% Wet: 2 13.3% Snow/Ice: Slush: Water/Sand: Repairing: Unspecified: Type of Vehicle #VEH % Passenger Car: 26 92.9% Bus: Truck: 1 3.6% Taxi: 1 3.6% Minivan: Police/Emergency Vehicle: Motorcycle/Moped: Bicycle: Fixed Object: Unspecified: Accident Severity Type #ACC % Fatal Collision: Injury Collision: 7 46.7% PDO Collision: 8 53.3% Light Condition #ACC % Daylight: 7 46.7% Dawn/Dusk: Dark(Lighted): 7 46.7% Dark(Not Lighted): 1 6.7% Dark(Unknown Lighting): Unspecified: Contributing Factor #VEH % Driver: Speed: 1 3.6% Driver: Alcohol/Drug: Driver: Electronic Device: Driver: Others: 4 14.3% Vehicle: Roadway: Unspecified: 23 82.1% Pedestrian Actions #ACC % In Crosswalk with Signal: In Crosswalk against Signal: In Crosswalk no Signal: In Unmarked Crosswalk: Not in Crosswalk: From Between Parked Cars: Unspecified: 12 Records are not approved as of 11/18/213 1:22:1 AM W5-36