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A vibrant Seattle through transportation excellence Peter Hahn, Director

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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
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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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