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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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Twenty-two Foot Speed Bumps

Table 3: Typical Impacts of 22-foot Speed Bumps on Emergency Vehicles

Bureau of Traffic Management
Portland Office of Transportation
City of Portland, Oregon
January 1996

Vehicle Lowest
Speed
(mph)
Desirable
Speed
(mph)
Travel Time
Delay
(seconds)
Impact
Distance
(feet)
Engine 18 21 25 0.8 136
  21 30 1.7 323
  21 35 3.0 505
  21 40 5.0 752
Rescue 41 34 25 0.0 0
  34 30 0.0 0
  34 35 0.3 118
  34 40 1.5 263
Squad 1 24 25 0.4 80
  24 30 1.0 214
  24 35 2.1 433
  24 40 3.4 708
Truck 1 22 25 0.6 137
  22 30 1.4 320
  22 35 3.0 600
  22 40 4.9 885
Truck 4 16 25 1.8 254
  16 30 3.4 449
  16 35 5.9 674
  16 40 7.7 1039
Truck 41 14 25 3.0 316
  14 30 4.8 622
  14 35 7.2 912
  14 40 9.2 1322
 
Lowest Speed: This is the lowest speed a vehicle travels when crossing a 22-foot speed bump.
 
Desirable Speed: This is the speed a driver might wish to travel if there were no speed bumps.
 
Travel Time Delay: This is the additional time required to travel to a destination due to a 22-foot speed bump's influence.
 
Impact Distance: This is the length of street where a given vehicle cannot be driven at a given desirable speed because of the speed bump's influence.
 

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