CMF / CRF Details
CMF ID: 10430
Conversion of intersection to roundabout
Description: Conversion of stop- and signal-controlled intersections into roundabouts
Prior Condition: No Prior Condition(s)
Category: Intersection geometry
Study: Effect of traffic roundabouts on accident rate and severity in Arizona, Mamlouk and Souliman, 2019
Star Quality Rating: |
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Crash Modification Factor (CMF) | |
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Value: | 1.62 |
Adjusted Standard Error: | |
Unadjusted Standard Error: |
Crash Reduction Factor (CRF) | |
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Value: | -62 (This value indicates an increase in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: |
Applicability | |
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Crash Type: | All |
Crash Severity: | All |
Roadway Types: | Not specified |
Number of Lanes: | |
Road Division Type: | |
Speed Limit: | |
Area Type: | Urban |
Traffic Volume: | |
Average Traffic Volume: | |
Time of Day: | Not specified |
If countermeasure is intersection-based | |
Intersection Type: | Roadway/roadway (not interchange related) |
Intersection Geometry: | Not specified |
Traffic Control: | Roundabout |
Major Road Traffic Volume: | |
Minor Road Traffic Volume: | |
Average Major Road Volume : | |
Average Minor Road Volume : |
Development Details | |
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Date Range of Data Used: | |
Municipality: | |
State: | AZ |
Country: | USA |
Type of Methodology Used: | Simple before/after |
Sample Size (sites): | 6 sites before, 6 sites after |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Jun-01-2020 |
Comments: | For double-lane roundabout. Change in accident rate per year. |