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A vibrant Seattle through transportation excellence Interim Director, Goran Sparrman

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Neighborhood Traffic Operations Home
Frequently Asked Questions
Resident Request Form
Traffic Circle Program
Scoring Criteria
Typical Traffic Circle Design
Traffic Calming Program
Enrollment Form
Evening Community Meetings
Neighborhood Speed Monitoring
Community Oriented Traffic Calming
Physical Traffic Calming Devices
Arterial Traffic Calming Program
Other Funding Sources

Traffic Circle Program: Scoring Criteria



Reported Collision History
Points are determined from annual Accident Rates - average number of reported accidents over the past three years.

Points

Annual Accident Rate (accidents/year) at intersection

1

0.5 - 0.875

2

0.876 - 1.250

3

1.251 - 1.625

4

1.626 - 2.000

5

2.001 - 2.375

6

2.376 - 2.750

 

Traffic Volumes
(Vehicles per Day - Average Weekday Traffic)
Points Traffic Volumes
0.5 500 - 1100
1.0 1101 - 1700
1.5 1701 - 2300
2.0 2301 - 2700

Traffic Speeds
(85th Percentile Speed)
Points Traffic Speeds (mph)
0.5 26 - 29
1.0 29.1 - 32
1.5 32.1 - 35
2.0 35.1 - 38
2.5 38.1 - 41
3.0 41.1 - 44

 

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