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: 1 Star   [View score details]
Crash Modification Factor (CMF)
Value: 1.62
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value: -62   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
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
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
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Jun-01-2020
Comments: For double-lane roundabout. Change in accident rate per year.