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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

More Contact Info

Fourteen Foot Speed Bumps

 

Vehicle

Lowest

Speed
(mph)

Desirable
Speed

(mph)

Travel Time

Delay

(seconds)

Impact Distance (feet)

Engine 18 13 25 2.3 236
  13 30 3.7 399
  13 35 5.2 581
  13 40 7.7 814
Rescue 41 17 25 1.0 147
  17 30 1.7 269
  17 35 2.9 483
  17 40 4.9 628
Squad 1 12 25 2.7 244
  12 30 4.1 436
  12 35 5.9 611
  12 40 8.3 852
Truck 1 11 25 3.4 269
  11 30 4.9 455
  11 35 6.6 646
  11 40 9.4 931
Truck 4 12 25 3.4 315
  12 30 4.9 485
  12 35 6.8 732
  12 40 9.1 1053
Truck 41 12 25 3.5 327
  12 30 4.7 472
  12 35 6.6 762
  12 40 8.6 1152 

Speed Bumps Defined

Lowest Speed This is the lowest speed a vehicle travels when crossing a 14-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 14-foot speed bump's influence.
Impact Distance This is the length of street where a given vehicle cannot be driven at the desired speed because of the speed bump's influence.