CMF / CRF Details

CMF ID: 410

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: 2 Stars   [View score details]
Rating Points Total: 65
Crash Modification Factor (CMF)
Value: 0.34
Adjusted Standard Error: 0.18
Unadjusted Standard Error: 0.08
Crash Reduction Factor (CRF)
Value: 66   (This value indicates a decrease in crashes)
Adjusted Standard Error: 18
Unadjusted Standard Error: 8
Crash Type: Speed related
Crash Severity: Not specified
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: 3
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-01-2009