CMF / CRF Details

CMF ID: 406

Transverse bar pavement marking at roundabout approaches


Prior Condition: No Prior Condition(s)

Category: Speed management

Study: A Review of Two Innovative Pavement Patterns that Have Been Developed to Reduce Traffic Speeds and Crashes, Griffin and Reinhardt, 1996

Star Quality Rating: 4 Stars
Crash Modification Factor (CMF)
Value: 0.43
Adjusted Standard Error: 0.19
Unadjusted Standard Error: 0.08
Crash Reduction Factor (CRF)
Value: 57   (This value indicates a decrease in crashes)
Adjusted Standard Error: 19
Unadjusted Standard Error: 8
Crash Type: Speed related
Crash Severity: A (serious injury),B (minor injury),C (possible injury)
Roadway Types: Not specified
Number of Lanes:
Road Division Type:
Speed Limit:
Area Type: Not specified
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: Roundabout
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:
Type of Methodology Used: Simple before/after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-01-2009