CMF / CRF Details

CMF ID: 2340

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: 0.843
Adjusted Standard Error:
Unadjusted Standard Error: 0.048
Crash Reduction Factor (CRF)
Value: 15.7   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 4.8
Applicability
Crash Type: All
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: