CMF / CRF Details

CMF ID: 3010

Install one left-turn lane on the minor approach of an unsignalized 3-leg intersection

Description: Install one left-turn lane on the minor approach of an unsignalized 3-leg intersection

Prior Condition: unsignalized 3-leg intersection with no left-turn lane on the minor approach

Category: Intersection geometry

Study: The Group Least Absolute Shrinkage and Selection Operator "GLASSO" Technique: Application in Variable Selection and Crash Prediction at Unsignalized Intersections, Haleem and Abdel-Aty, 2010

 
Star Quality Rating: 3 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.75
Adjusted Standard Error:
Unadjusted Standard Error: 0.1097
Crash Reduction Factor (CRF)
Value: 25   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 10.97
Applicability
Crash Type: All
Crash Severity: All
Roadway Types: Not Specified
Number of Lanes: 2 to 8
Road Division Type:
Speed Limit:
Area Type: All
Traffic Volume:
Average Traffic Volume:
Time of Day: All
If countermeasure is intersection-based
Intersection Type: Roadway/roadway (not interchange related)
Intersection Geometry: 3-leg
Traffic Control: Stop-controlled
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used: 2003 to 2006
Municipality:
State: FL
Country: U.S.A.
Type of Methodology Used: Regression cross-section
Sample Size (sites): 1735 sites
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Jul-15-2011
Comments: