K Street EB at 27th Street NW

Speed Limit and Safety Nexus Studies for Automated
Enforcement Locations in the District of Columbia
K Street EB at 27th Street NW
Study Area and Location
District
2
PSA
207
Ward
2
ANC
2A
Phase
Planned
Description
K Street Eastbound at 27th Street Northwest
Site 7
Waterfront
Park
Fashion
Institute of
Design
KEY:
Planned Camera
Proposed Camera
Bus Stop
Metro Station
Hiker/Biker Trail
School
Other Pedestrian Generator
George
Washington
University
The planned speed camera will be located in Ward 2 at the intersection of K Street and 27 th Street NW in the
eastbound direction. K Street runs between Whitehurst Freeway Northwest to the west through downtown
Washington, DC and to Florida Avenue Northeast to the east. The posted speed limit is 25 MPH.
W2 - 53
District Department of Transportation
55 M Street, SE, Suite 400
Washington, DC 20003
K Street EB at 27th Street NW
Field Assessment Summary
K Street NW is assumed to run in an East-West direction, and is classified as a principal arterial. K Street has
three through lanes and one shared through-right turn lane in the westbound direction, and a left turn lane,
two through lanes, and a shared through-right lane in the eastbound direction. 27th Street NW has one
through lane in the southbound direction and one left turn lane and one shared left/right turn lane in the
northbound direction. This site has the following characteristics:
This site is located in a residential area with houses and apartments in the surrounding area to the
east.
The site is also adjacent to the Whitehurst Freeway and Rock Creek and Potomac Parkway, which
carries mostly commuting traffic during the weekday peak hours.
There is sidewalk with curb and gutter and drainage inlets on the eastbound side of the east leg.
There are concrete medians on east and west legs and grass median on north leg.
There is a traffic signal and crosswalk on the south leg with pedestrian signals.
There are three schools in this area: Georgetown University, Fashion Institute of Design, and
Georgetown Montessori School.
The Rock Creek Park Trails and Chesapeake and Ohio Canal National Historic Park are also in the area.
Looking Eastbound
W2 - 54
District Department of Transportation
55 M Street, SE, Suite 400
Washington, DC 20003
K Street EB at 27th Street NW
Looking Westbound
Speed Data Analysis
Posted Speed Limit (MPH)
25
11
Mean Speed (MPH)
15
85th Percentile Speed (MPH)
10 MPH Pace Speed
4-13
ADT
5,412
Both the mean speed and the 85th percentile speed are significantly lower than the posted speed limit. The
85th percentile speed is 10 MPH lower than the posted speed limit.
Crash Data Analysis
From the Accident Summary Report provided for the dates between January 1, 2010 and December 31, 2012,
there were a total of 37 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 (18
crashes) and Side Swipe (10 crashes). The other collision types had less than three crashes or less.
W2 - 55
District Department of Transportation
55 M Street, SE, Suite 400
Washington, DC 20003
K Street EB at 27th Street NW
Total
Fatal
Injury
Taxi
Truck
Severity
37
0
9
11
3
Weather
0.0%
24.3%
29.7%
8.1%
Clear
Rain
Snow
30
2
0
Surface condition
81.1%
5.4%
0.0%
Dry
Wet
Snow/Ice
30
4
1
Light Condition
81.1%
10.8%
2.7%
Day
Night
18
19
48.6%
51.4%
Number of Crashes by Collision Type
20
Rear End
18
16
12
0
Unspecified
2
Left Turn
4
Right Angle
6
Pedestrian
8
Fixed Object
Side Swipe
10
Right Turn
Number of Crashes
14
Collision Type
There was an elevated number of speed related crashes at this location, including rear end and side swipe
crashes. The 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
rear-end and sideswipe crashes. Both of these errors can be decreased with a decrease in travel speed.
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 speed data analysis shows travel speeds being lower than the posted speed limit.
2. Crash Data – There was an elevated number of speed-related crashes at this location, including rear end
collisions. There was a high frequency (9 crashes) of injury-related crashes at this location.
1
AASHTO Highway Safety Manual, 1st Edition, 2010; Volume 1, page 2-13
W2 - 56
District Department of Transportation
55 M Street, SE, Suite 400
Washington, DC 20003
K Street EB at 27th Street NW
3. Field Assessment – The following site characteristics suggest a need for a safer travel environment:
a. This site is located in a residential area with houses and apartments in the surrounding area to the
east.
b. The site is also adjacent to the Whitehurst Freeway and Rock Creek and Potomac Parkway, which
carries mostly commuting traffic during the weekday peak hours.
c. There are three schools in this area: Georgetown University, Fashion Institute of Design, and
Georgetown Montessori School.
d. The Rock Creek Park Trails and Chesapeake and Ohio Canal National Historic Park are in the area
which generates pedestrian activity.
Although the speed data analysis showed the mean and 85th percentile speeds to be lower than the posted
speed limit, due to the elevated number of speed-related and injury-related crashes, the specific site
characteristics, the proximity of schools to the site, and other pedestrian generators, there is a nexus between
traffic safety and the speed camera at this location.
W2 - 57
District Department of Transportation
55 M Street, SE, Suite 400
Washington, DC 20003
SAMMAT ENGINEERING SERVICES, LLC
1515 RISING RIDGE ROAD
MOUNT AIRY, MD 21771
www.sammateng.com
K St EB at 27th St NW Speed
EB
Start
Time
11/12/13
01:00
02:00
03:00
04:00
05:00
06:00
07:00
08:00
09:00
10:00
11:00
12 PM
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00
Total
1
15
*
*
17
15
122
208
250
268
296
279
180
257
248
242
236
206
231
148
145
189
189
197
127
60
4110
16
20
*
*
1
2
10
37
75
111
80
36
11
32
27
25
25
12
12
1
3
14
21
26
12
16
589
21
25
*
*
4
6
11
42
89
102
62
24
6
20
14
16
12
7
5
0
1
3
7
7
6
3
447
26
30
*
*
1
5
6
34
47
33
10
5
1
4
3
10
1
4
4
0
0
1
6
2
2
2
181
31
35
*
*
0
0
2
7
3
1
0
1
0
0
1
1
0
2
0
0
0
1
2
1
1
0
23
36
40
*
*
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
1
41
45
*
*
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
1
46
50
*
*
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
51
55
*
*
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
56
60
*
*
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
61
65
*
*
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
66
70
*
*
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
71
75
*
*
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
76
999
*
*
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Total
*
*
23
28
151
328
464
515
448
345
198
313
293
294
275
231
252
149
149
208
225
234
148
81
5352
W2-58
SAMMAT ENGINEERING SERVICES, LLC
1515 RISING RIDGE ROAD
MOUNT AIRY, MD 21771
www.sammateng.com
K St EB at 27th St NW Speed
EB
Start
Time
11/13/13
01:00
02:00
03:00
04:00
05:00
06:00
07:00
08:00
09:00
10:00
11:00
12 PM
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00
Total
Grand
Total
Stats
1
15
16
20
21
25
26
30
31
35
36
40
41
45
46
50
51
55
56
60
61
65
66
70
71
75
76
999
Total
4152
599
451
184
24
1
1
0
0
0
0
0
0
0
5412
29
13
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
42
4
6
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
10
4
0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
4
2
1
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
3
0
1
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
1
0
0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
0
15th Percentile :
50th Percentile :
85th Percentile :
95th Percentile :
4 MPH
9 MPH
15 MPH
22 MPH
Mean Speed(Average) :
10 MPH Pace Speed :
Number in Pace :
Percent in Pace :
Number of Vehicles > 25 MPH :
Percent of Vehicles > 25 MPH :
11 MPH
4-13 MPH
3715
68.6%
145
2.7%
0
0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
0
0
0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
0
0
0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
0
0
0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
0
0
0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
0
0
0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
0
0
0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
0
0
0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
0
39
21
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
60
W2-59
SAMMAT ENGINEERING SERVICES, LLC
1515 RISING RIDGE ROAD
MOUNT AIRY, MD 21771
www.sammateng.com
K St EB at 27th St NW Volume
Start
Time
12:00
12:15
12:30
12:45
01:00
01:15
01:30
01:45
02:00
02:15
02:30
02:45
03:00
03:15
03:30
03:45
04:00
04:15
04:30
04:45
05:00
05:15
05:30
05:45
06:00
06:15
06:30
06:45
07:00
07:15
07:30
07:45
08:00
08:15
08:30
08:45
09:00
09:15
09:30
09:45
10:00
10:15
10:30
10:45
11:00
11:15
11:30
11:45
Total
Combined
Total
Peak
Vol.
P.H.F.
ADT
Tue
A.M.
12-Nov-13
P.M.
*
*
*
*
*
*
*
*
6
7
4
6
4
5
12
7
16
28
51
56
57
71
94
106
95
128
109
132
121
137
139
118
122
125
100
101
89
87
56
113
61
48
35
54
78
77
79
79
2813
84
60
72
77
67
79
82
66
75
80
69
51
67
70
52
42
70
56
67
59
47
31
37
34
31
35
36
47
35
50
61
62
56
51
58
60
55
62
59
58
59
32
35
22
28
25
15
13
2539
5352
06:45
529
0.951
00:45
305
0.930
ADT 5,412
Wed
A.M.
13-Nov-13
P.M.
14
5
15
5
6
7
5
3
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
60
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
0
60
12:00
39
0.650
AADT 5,412
Thu
A.M.
14-Nov-13
P.M.
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
0
0
Daily Average
A.M.
P.M.
14
5
15
5
6
7
5
3
6
7
4
6
4
5
12
7
16
28
51
56
57
71
94
106
95
128
109
132
121
137
139
118
122
125
100
101
89
87
56
113
61
48
35
54
78
77
79
79
2873
84
60
72
77
67
79
82
66
75
80
69
51
67
70
52
42
70
56
67
59
47
31
37
34
31
35
36
47
35
50
61
62
56
51
58
60
55
62
59
58
59
32
35
22
28
25
15
13
2539
5412
06:45
529
0.951
00:45
305
0.930
W2-60
DC Department of Transportation - Traffic Accident Reporting and Analysis System
Accident Summary Report (R-8)
Corridor:
K ST,NW,NE From TWENTY FIFTH ST,NW TO TWENTY SEVENTH ST,NW
Time Period Covered:
From 01/01/2010 To 12/31/2012
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:
Time of Day
37
0
11
1
1
1
1
1
Prepared By: Rahul Jain
Collision Type
Right Angle:
Left Turn:
Right Turn:
Rear End:
Side Swiped:
Head On:
Parked:
#ACC
1
1
2
18
10
0
0
%
2.7%
2.7%
5.4%
48.6%
27.0%
0.0%
0.0%
Prepared Date:
Collision Type
Fixed Object:
Ran Off Road:
Ped. Involved:
Backing:
Non Collision:
Under/Over Ride:
Unspecified:
10/6/2013
#ACC
3
0
1
0
0
0
1
%
8.1%
0.0%
2.7%
0.0%
0.0%
0.0%
2.7%
16:00 ~18:30:
18:30 ~ 07:30:
Unspecified:
#ACC
2
2
2
7
4
20
0
%
5.4%
5.4%
5.4%
18.9%
10.8%
54.1%
0.0%
Day o fweek
Sunday:
Monday:
Tuesday:
Wednesday:
Thursday:
Friday:
Saturday:
#ACC
6
4
9
2
4
8
4
%
16.2%
10.8%
24.3%
5.4%
10.8%
21.6%
10.8%
Weather Condition
Clear:
Rain:
Snow:
Sleet/Hail:
Fog/Mist:
Crosswind/Blowing Sand:
Unspecified:
#ACC
30
2
0
0
2
1
2
%
81.1%
5.4%
0.0%
0.0%
5.4%
2.7%
5.4%
Surface Condition
Dry:
Wet:
Snow/Ice:
Slush:
Water/Sand:
Repairing:
Unspecified:
#ACC
30
4
1
0
0
0
2
%
81.1%
10.8%
2.7%
0.0%
0.0%
0.0%
5.4%
Type of Vehicle
Passenger Car:
Bus:
Truck:
Taxi:
Minivan:
Police/Emergency Vehicle:
Motorcycle/Moped:
Bicycle:
Fixed Object:
Unspecified:
#VEH
46
2
3
11
0
0
1
1
0
4
%
67.6%
2.9%
4.4%
16.2%
0.0%
0.0%
1.5%
1.5%
0.0%
5.9%
Accident Severity Type
Fatal Collision:
Injury Collision:
PDO Collision:
#ACC
0
9
28
%
0.0%
24.3%
75.7%
Light Condition
Daylight:
Dawn/Dusk:
Dark(Lighted):
Dark(Not Lighted):
Dark(Unknown Lighting):
Unspecified:
#ACC
18
0
19
0
0
0
%
48.6%
0.0%
51.4%
0.0%
0.0%
0.0%
Contributing Factor
Driver: Speed:
Driver: Alcohol/Drug:
Driver: Electronic Device:
Driver: Others:
Vehicle:
Roadway:
Unspecified:
#VEH
0
2
0
11
0
2
53
%
0.0%
2.9%
0.0%
16.2%
0.0%
2.9%
77.9%
Pedestrian Actions
In Crosswalk with Signal:
In Crosswalk against Signal:
In Crosswalk no Signal:
In Unmarked Crosswalk:
Not in Crosswalk:
From Between Parked Cars:
Unspecified:
#ACC
0
0
0
0
0
0
1
%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
07:30 ~ 09:30:
09:30 ~ 11:30:
11:30 ~ 13:30:
13:30 ~ 16:00:
21 Records are not approved as of 10/6/2013 11:54:50 AM
W2-61