City of Tigard > City Hall > Departments > Community Development > Capital Construction

Speed Cushion Program

Home > City Hall > Departments > Community Development > Capital Construction and Transportation > Traffic Calming > Speed Cushion Program

Speed Cushion Program: Criteria for Eligibility
The posted speed limit on any City of Tigard street must be 25 mph or less for the street to be considered for the Speed Cushion Program. The following are the established criteria (based on a point system) in the evaluation of those City of Tigard streets that meet the 25 mph requirement to establish a priority list for installation of speed cushions:

1. Speed:
The difference between the 85th percentile speed and the posted speed should be at east 5 mph or more up to 10 mph. Each mph over the 5 mph up to 10 counts as one point.

2. Volume:
The average two-way, weekday daily volume divided by 1,000 will be ranked from 0 to 6.

3. Accidents:
The number of accidents in the past years will be rated from 0 to 5.

4. Sidewalks:
One point is added if there are no pedestrian facilities and none if there are existing walkways.

5. Cut-Through Traffic:
This is determined by the type of intersecting street on either end of the subject street ranging from 0 to 5 as follows:

Arterial to Arterial (5)
Arterial and Major Collector (4)
Major Collector to Major Collector (3)
Major Collector to Minor Collector (2)
Minor Collector to Minor collector (1)

6. Other Factors:
This includes efforts by the neighborhood to help itself by participating in the Neighborhood Speed Watch Radar Program, the SMART Trailer, whether it has a Strictly Enforced area, or other similar methods in cooperation with the Police Department to reduce speeds. This is used to further narrow the list of eligible streets by providing information on the interest the neighborhood has demonstrated in reducing speeds, other than just requesting speed humps.

Streets will be ranked in order of priority based on the total number of points accumulated, the higher the total number the better.

Note: Speed cushions will be installed only on streets or on segments of streets that have grades less than 8%. In addition, humps will not be installed on sharp curves. Cushions on steeper grades or on sharp curves create safety hazards that outweigh any benefits derived from the device.