If you have concerns about vehicle speeding on your street, traffic calming measures may be considered for implementation following Policy R-20(PDF, 89KB). Please submit a service request through Our Kirkland using the issue type “Traffic Concerns – Neighborhood Traffic Calming.” City staff will evaluate your request using the following criteria.
Traffic Calming Screening Checklist
- The street is not an arterial.
- The street has no more than two lanes.
- The speed limit is 25 miles per hour or lower.
- The street has average daily traffic volumes of at least 300 and less than 4,000 vehicles.
- At least 15% of the vehicles are exceeding the speed limit by at least 5 miles per hour as determined by a traffic study.
Check if a recent traffic study has been done in your neighborhood. If recent speed and volume data are not available, the City will conduct a traffic study.
Based on the recorded speeds and volumes of a particular street, a Transportation Engineer may recommend one or more of the following traffic calming measures.
Phase One (Low intervention, vehicle speeds in excess of 5-7mph of the speed limit):
- Request for Police speed enforcement at a specific time of day
- Deployment of the portable speed radar trailer
- Added signage related to school zones
- Upgrades or replacement of existing signage
- Roadway striping
Phase Two (Medium intervention, vehicle speeds in excess of 5-7mph of the speed limit):
- Additional/revised roadway striping
- Permanent radar speed signs
- Curb bulbs
- Traffic circles
Phase Three** (High intervention prior traffic calming measures have been implemented and speeding persists in excess of 7mph of the speed limit):
- Additional/revised curb bulbs
- Additional/revised traffic circles
- Speed cushions
- Raised crosswalks
**For Phase Three traffic calming measures, there are additional criteria that must be met prior to implementation:
- The street is not on a primary emergency response route or bus route.
- Traffic volumes should include no more than 5% long wheel based vehicles.
- At least 15% of vehicles must be exceeding the speed limit by at least 7mph as determined by traffic studies.
- Pre and post implementation traffic studies are conducted on the street of the traffic calming device and on parallel or connecting local streets to determine network impacts.
Phase Three measures also require neighborhood engagement:
- The City will identify the area of influence of the traffic calming measure, which is typically the residences immediately on the street of the traffic calming intervention and connecting local streets.
- The City will seek comment from the neighborhood area of influence by conducting door-to-door outreach or distributing a mailer with information on the traffic calming measure. The comment period is typically two weeks from the date of mailing.
- Based on neighborhood comments, the City will revise the design or location of the traffic calming measure(s) as appropriate.
Following the implementation of traffic calming measures, the City will conduct a follow-up traffic study (typically 6 months after) to monitor vehicle speeds and volumes and determine if additional intervention is needed.