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Portland Bureau of Transportation

Phone: 503-823-5185

Fax: 503-823-7576

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

More Contact Info

Traffic Calming Devices & Photos

Devices 101

A power point introduction to traffic calming devices

Speed Bumps

Information on Portland speed bumps from the Bureau of Traffic Management Traffic Manual, 1994

Raised Crosswalks

Raised cross walks are cross walks constructed 3-4 inches above the elevation of the street.

Curb Extensions

Curb extensions narrow the street by widening the sidewalk or the landscaped parking strip.

Pedestrian Refuges/Slow Points

Pedestrian refuges or slow points are small islands in the middle of the street, typically designed with marked bike lanes on both sides.

Choke Point

Choke Points are curb extensions placed mid block to narrow the roadway to 14' or the equivalent of one travel lane.

Vehicle Exclusion Lanes

Exclusion lanes are lanes for a particular class of vehicle, excluding all others.

Cul de Sacs

Cul-de-Sacs close one end of a street.

Median Barriers

A median barrier is a concrete curb or island that is located on the centerline of a street and continues through the street's intersection with a given cross street.


Semi-diverters are curb extensions or islands that block one lane of the street.

Diagonal Diverters

Diagonal diverters place a barrier diagonally across an intersection, disconnecting the legs of the intersection.

Entrance Treatments

Entrance treatments consist of physical and textural changes to streets and are located at key entry ways into a neighborhood


A chicane changes a street's path from straight to serpentine

Traffic Circles

Traffic circles are raised islands placed in an intersection

Speed Bumps

Speed bumps are asphalt mounds constructed on streets and spaced 300 to 600 feet apart

School Improvements PHOTOS

School Improvements PHOTOS

Pedestrian Improvements PHOTOS

Pedestrian Improvements PHOTOS

Traffic Circle PHOTOS

Traffic Circle PHOTOS

Traffic Volume Reduction PHOTOS

Traffic Volume Reduction PHOTOS

Rubber Speed Bumps PHOTOS

Rubber Speed Bumps PHOTOS