Neighborhood Traffic Control Program
Typical Traffic Calming Measures

Speed Watch | Traffic Circles | Chicanes
Speed Humps | Curb Bulbs

If you have any questions about the Neighborhood Traffic Calming Program, or are interested in applying for a traffic circle, please contact 684-0817.

Speed Watch Program

A cooperative effort between the community, SDOT, and the Seattle Police Department to encourage motorists to drive safely. Click here for more information.


The following options can be used individually or in combination as determined by a traffic engineer:

Traffic Circles

Traffic circles are raised islands at intersections of residential streets. Motorists must reduce speed to maneuver around the circle, which helps reduce accidents.

Best used when:

• there are many accidents at the intersection.
• speeding problem exists.

Click here for more information.

Chicanes

Chicanes are a set of two or three curb bulbs that alternate from one side of the street to the other creating a one-lane segment of roadway.

Most effective at reducing mid-block speeds and may reduce volumes.

Best used when:

• traffic speeds are greater than 35 MPH.
• there is strong community support.

Speed Humps

Speed humps are paved mounds raise about 3" that extend the width of the street.

Effective at reducing mid-block speeds and may reduce volumes.

Best used when:

• 15 % of traffic exceeds 35 MPH.
• 400 vehicles or more per day.
• no alternative devices available.

Curb Bulbs

Curb bulbs extend the curb into the street. They improve pedestrian crossing by shortening the crossing distance and providing improved visibility.

May also help to reduce speeds by narrowing the roadway and restricting turning speeds.

Wheel stops Courtland Wheelstops Report - Alternative Curb Demonstration Project Overview For Courtland Place South

Traffic Calming Slide Show