CMF / CRF Details

CMF ID: 2350

Install TWLTL (two-way left turn lane) on two lane road

Description:

Prior Condition:  No Prior Condition(s)

Category: Roadway

Study: Safety Evaluation of Installing Center Two-Way Left-Turn Lanes on Two-Lane Roads, Lyon et al., 2008

 
Star Quality Rating:4 Stars  [View score details]
Rating Points Total:120
Crash Modification Factor (CMF)
Value:0.783
Adjusted Standard Error:
Unadjusted Standard Error:0.077
Crash Reduction Factor (CRF)
Value:21.7  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:7.7
Applicability
Crash Type:Rear end
Crash Severity:All
Roadway Types:Not Specified
Street Type:
Minimum Number of Lanes:2
Maximum Number of Lanes:2
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Divided by TWLTL
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:All
Traffic Volume:
Average Traffic Volume:
Time of Day:All
If countermeasure is intersection-based
Intersection Type:
Intersection Geometry:
Traffic Control:
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:1990 to 2004
Municipality:
State:NC
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: