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Portland Bureau of Transportation

We keep Portland moving

Phone: 503-823-5185

Fax: 503-823-7576

1120 SW Fifth Ave, Suite 800, Portland, OR 97204

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Collisions on Traffic Calmed Streets

Several streets which have traffic calming devices were reviewed for the occurrence of collisions. Though the number of collisions at particular intersections had no predictable pattern, total collisions along the length of the street tended to decrease, as did injuries from those collisions. Not analyzed was the severity of collisions before and after traffic calming.


Project
Street

Street
Class

Street
Length (ft)
Traffic
Speed
Devices

Diversion
Intended

Speed (mph)

ADT
Reported
Collisions

Period
(months)

Collisions/1000 vpd
Pre Post Pre Post Pre Post Pre Post % Change
NE 7th Avenue LS 4300 5 Circles N 36-40 32 6500 5500 55 30 36 8.46 5.45 -35.54%
SE Clinton Street on (1) LS 6200 4 Circles Y 37 33 2400 2000 145 116 52 60.42 58.00 -4.00%
SE Clinton (2) LS 2900 4 Circles Y 36 32 1200 680 35 20 52 29.17 29.41 0.84%
NE Holman LS 2600 3 Circles N 32-34 31-34 1400 1100 30 29 74 21.43 26.36 23.03%
NE 21st LS 1700 2 Circles N 34 30 5600 5600 9 8 61 1.61 1.43 -11.11%
NE 24th LS 2000 3 Circles N 36 29 3500 3200 19 6 61 5.43 1.88 -65.46%
NW 25th LS 1500 3 Circles N 33 28 7800 6500 25 12 76 3.21 1.85 -42.40%
NW Raleigh LS 1500 2 Circles N 30 26 2100 1500 0 1 76 0.00 0.67 -
  Circle Total 318 222   129.71 125.05  
  % Change -30.19%   % Change -3.60%  
 
NW Cornell NC 3200 4 22ft Bumps N 32-40 28-32 6500 6400 1 2 29 0.15 0.31  
NE 15th (1) NC 2300 3
22ft Bumps
N 35-40 25-30 8440 6780 16 8 15 1.90 1.18 -37.76%
NE 15th (2) NC 2200 4
22ft Bumps
N 35-40 25-30 8440 6780 27 16 26 3.20 2.36 -26.23%
SE Harold LS 5000 8
22ft Bumps
N 37-40 30-34 4210 2550 12 10 15 2.85 3.92 37.58%
  22 ft Bump Total 56 36   8.10 7.77  
  %
Change
-35.71%   % Change -4.01%  
 
N Macrum LS 2280 7
14ft Bumps
N 32-34 20-26 480 370 4 3 41 8.33 8.11 -2.70%
NE Pacific LS 1400 4
14ft Bumps
N 34 24 600 600 10 11 41 16.67 18.33 10.00%
NE 108th LS 1000 2 14ft Bumps N 32 23 770 700 5 3 41 6.49 4.29 -34.00%
SE 55th LS 1600 4 12ft Bumps N 26-37 21-25 2300 1900 13 4 41 5.65 2.11 -62.75%
SW Boones Ferry LS 3000 5 14ft Bumps Y 28-35 23-26 4000 1500 29 16 28 7.25 10.67 47.13%
  14 ft Bump Total 61 37   44.40 43.50  
  % Change -39.34%   % Change -2.02%  
 

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