Study Area and Location District PSA Ward ANC Phase Description A Proposed I-395 Southwest after Exit 4, Eastbound

Transcription

1 Speed Limit and Safety Nexus Studies for Automated Enforcement Locations in the District of Columbia I-395 SW after Exit 4 E/B Study Area and Location District PSA Ward ANC Phase Description A Proposed I-395 Southwest after Exit 4, Eastbound Site 279 KEY: Existing Camera Proposed Camera Bus Stop Metro Station Hiker/Biker Trail School Other Pedestrian Generator The proposed speed camera is located in Ward 8 on I-395 Southwest after Exit 4 in the eastbound direction. I- 395 runs between US 5 / New York Avenue NW to the north and I-95 to the south. The posted speed limit is 4 MPH. W8-1 District Department of Transportation 55 M Street, SE, Suite 4 Washington, DC 23

2 I-395 SW after Exit 4 E/B Field Assessment Summary I-395 is assumed to run in an east-west direction, and is classified as an interstate. I-395 has seven travel lanes eastbound and five travel lanes westbound. This site has the following characteristics: There are several bus stops in the surrounding area. The L Enfant Plaza Metro Station is located nearby. Several tourist attractions including the Thomas Jefferson Memorial are in the area and generate pedestrian activity. There are two concrete barriers present at this location. One separates eastbound and westbound traffic. The other separates the five lanes eastbound into three lanes eastbound and three lanes exiting at Exit 4 - Maine Avenue. The pavement is in good condition and there is curb and gutter with drainage inlets. Looking Eastbound W8-11 District Department of Transportation 55 M Street, SE, Suite 4 Washington, DC 23

3 I-395 SW after Exit 4 E/B Speed Data Analysis Posted Speed Limit (MPH) 4 Mean Speed (MPH) 4 85th Percentile Speed (MPH) 56 1 MPH Pace Speed ADT 39,427 The mean speed is equal to the posted speed limit and the 85 th percentile speed is 16 MPH higher than the posted speed at this location. 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 19 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 (11 crashes) and Side Swiped (6 crashes). The other collision types had 1 crash or less each. Furthermore, the site experienced six injury-related crashes. Severity Weather Surface Condition Light Condition Total 19 Fatal Clear % Dry % Day % Injury % Rain 1 Wet 2 1.5% Night 4 Bus 1 Snow Snow/Ice Truck 2 1.5% W8-12 District Department of Transportation 55 M Street, SE, Suite 4 Washington, DC 23

4 I-395 SW after Exit 4 E/B 12 Number of Crashes by Collision Type 1 Rear End Number of Crashes Side Swipe 2 Right Angle Fixed Object Collision Type Safety Nexus This site presents the following safety considerations which may establish a safety nexus between the speed camera and safety. 1. Speed Data The 85th percentile speed is much higher than the posted speed limit at this location. 2. Crash Data There was six injury-related crashes at this location. 3. Field Assessment The following site characteristics suggest a need for a safer travel environment: a. There are two concrete barriers present at this location. One separates eastbound and westbound traffic. The other separates the five lanes eastbound into three lanes eastbound and three lanes exiting at Exit 4 - Maine Avenue. Slower travel speeds are needed to facilitate safer weaving and merging operations in this section of I-395. Due to elevated 85 th percentile speeds through the corridor and the desire for slower speeds due to weaving and merging operations on this segment, there is a nexus between traffic safety and the speed camera at this location. W8-13 District Department of Transportation 55 M Street, SE, Suite 4 Washington, DC 23

5 I-395 SW after Exit 4 EB Speed SAMMAT ENGINEERING SERVICES, LLC 1515 RISING RIDGE ROAD MOUNT AIRY, MD EB Start Time Total 12/4/13 * * * * * * * * * * * * * * * 1: * * * * * * * * * * * * * * * 2: * * * * * * * * * * * * * * * 3: : : : : : : : : PM : : : : : : : : : : : Total W8-14

6 I-395 SW after Exit 4 EB Speed SAMMAT ENGINEERING SERVICES, LLC 1515 RISING RIDGE ROAD MOUNT AIRY, MD EB Start Time Total 12/5/ : : : : * * * * * * * * * * * * * * * 5: * * * * * * * * * * * * * * * 6: * * * * * * * * * * * * * * * 7: * * * * * * * * * * * * * * * 8: * * * * * * * * * * * * * * * 9: * * * * * * * * * * * * * * * 1: * * * * * * * * * * * * * * * 11: * * * * * * * * * * * * * * * 12 PM * * * * * * * * * * * * * * * 13: * * * * * * * * * * * * * * * 14: * * * * * * * * * * * * * * * 15: * * * * * * * * * * * * * * * 16: * * * * * * * * * * * * * * * 17: * * * * * * * * * * * * * * * 18: * * * * * * * * * * * * * * * 19: * * * * * * * * * * * * * * * 2: * * * * * * * * * * * * * * * 21: * * * * * * * * * * * * * * * 22: * * * * * * * * * * * * * * * 23: * * * * * * * * * * * * * * * Total Grand Total th Percentile : 5th Percentile : 85th Percentile : 95th Percentile : 9 MPH 45 MPH 56 MPH 63 MPH Stats Mean Speed(Average) : 4 MPH 1 MPH Pace Speed : MPH Number in Pace : 1365 Percent in Pace : 33.8% Number of Vehicles > 4 MPH : Percent of Vehicles > 4 MPH : 66.7% W8-15

7 I-395 SW after Exit 4 EB Volume SAMMAT ENGINEERING SERVICES, LLC 1515 RISING RIDGE ROAD MOUNT AIRY, MD Start Wed 4-Dec-13 Thu 5-Dec-13 Fri 6-Dec-13 Daily Average Time A.M. P.M. A.M. P.M. A.M. P.M. A.M. P.M. 12: * * * * :15 * * * * :3 * * * * :45 * * * * : * * * * :15 * * * * :3 * * * * :45 * * * * : * * * * :15 * * * * :3 * * * * :45 * * * * : * * * * :15 * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * : * * * * Total Combined Total Peak 5:3 4:15 12: 5:3 4:15 Vol P.H.F ADT ADT 39,427 AADT 39,427 W8-16

8 DC Department of Transportation - Traffic Accident Reporting and Analysis System Accident Summary Report (R-8) Corridor: INTERSTATE 395,BN From INTERSTATE 695 INTERSTATE,BN TO 12TH ST EXPWY,SW Time Period Covered: From 1/1/21 To 12/31/212 Prepared By: admin TARAS Prepared Date: 1/2/214 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: Collision Type #ACC % Collision Type #ACC % Right Angle: 1 Fixed Object: 1 Left Turn: Ran Off Road: Right Turn: Ped. Involved: Rear End: % Backing: Side Swiped: % Non Collision: Head On: Under/Over Ride: Parked: Unspecified: Time of Day #ACC % 7:3 ~ 9:3: 4 9:3 ~ 11:3: 4 11:3 ~ 13:3: 13:3 ~ 16:: 4 16: ~18:3: 2 1.5% 18:3 ~ 7:3: % Unspecified: Day o fweek #ACC % Sunday: 2 1.5% Monday: 1 Tuesday: % Wednesday: 4 Thursday: % Friday: % Saturday: % Weather Condition #ACC % Clear: % Rain: 1 Snow: Sleet/Hail: Fog/Mist: Crosswind/Blowing Sand: Unspecified: 1 Surface Condition #ACC % Dry: % Wet: 2 1.5% Snow/Ice: Slush: Water/Sand: Repairing: Unspecified: 1 Type of Vehicle #VEH % Passenger Car: % Bus: 1 2.4% Truck: 2 4.9% Taxi: 1 2.4% Minivan: Police/Emergency Vehicle: Motorcycle/Moped: Bicycle: Fixed Object: Unspecified: 4 9.8% Accident Severity Type #ACC % Fatal Collision: Injury Collision: % PDO Collision: % Light Condition #ACC % Daylight: % Dawn/Dusk: 1 Dark(Lighted): 4 Dark(Not Lighted): Dark(Unknown Lighting): Unspecified: Contributing Factor #VEH % Driver: Speed: Driver: Alcohol/Drug: Driver: Electronic Device: Driver: Others: % Vehicle: 1 2.4% Roadway: Unspecified: % 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: Year Accidents Fatalities Injuries Disabling Injuries Pedestrians Bicycles Motorcycles Records are not approved as of 1/2/214 2:39:8 PM W8-17