CMF / CRF Details

CMF ID: 257

Provide a channelized left-turn lane on both major-road approaches

Description:

Prior Condition:  No Prior Condition(s)

Category: Intersection geometry

Study: Handbook of Road Safety Measures, Elvik, R. and Vaa, T., 2004

 
Star Quality Rating:3 Stars  [View score details]
Rating Points Total:75
Crash Modification Factor (CMF)
Value:0.84
Adjusted Standard Error:0.39
Unadjusted Standard Error:0.22
Crash Reduction Factor (CRF)
Value:16  (This value indicates a decrease in crashes)
Adjusted Standard Error:39
Unadjusted Standard Error:22
Applicability
Crash Type:All
Crash Severity:O (property damage only)
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:4-leg
Traffic Control:Not specified
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:Meta-analysis
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Dec 01, 2009
Comments:Countermeasure name has been slightly modified for consistency across Clearinghouse