CMF / CRF Details

CMF ID: 211

Conversion of stop-controlled intersection into single-lane roundabout

Description:

Prior Condition: No Prior Condition(s)

Category: Intersection geometry

Study: Observational Before-After Study of the Safety Effect of U.S. Roundabout Conversions Using the Empirical Bayes Method, Persaud et al., 2001

 
Star Quality Rating: 4 Stars   [View score details]
Rating Points Total: 120
Crash Modification Factor (CMF)
Value: 0.18
Adjusted Standard Error: 0.16
Unadjusted Standard Error: 0.09
Crash Reduction Factor (CRF)
Value: 82   (This value indicates a decrease in crashes)
Adjusted Standard Error: 16
Unadjusted Standard Error: 9
Applicability
Crash Type: All
Crash Severity: A (serious injury),B (minor injury),C (possible injury)
Roadway Types: Not specified
Street Type:
Minimum Number of Lanes:
Maximum Number of Lanes:
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather: Not specified
Road Division Type:
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type: Rural
Traffic Volume:
Average Traffic Volume:
Time of Day:
If countermeasure is intersection-based
Intersection Type: Roadway/roadway (not interchange related)
Intersection Geometry: Not specified
Traffic Control: Stop-controlled
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:
Country:
Type of Methodology Used: Before/after using empirical Bayes or full Bayes
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-01-2009
Comments: