CMF / CRF Details

CMF ID: 407

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)
Adjusted Standard Error:0.3
Unadjusted Standard Error:0.14
Crash Reduction Factor (CRF)
Value:47  (This value indicates a decrease in crashes)
Adjusted Standard Error:30
Unadjusted Standard Error:14
Crash Type:Speed related
Crash Severity:Not specified
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: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