CMF / CRF Details

CMF ID: 2518

Replace TWLTL with raised median


Prior Condition: Two way left turn lane (TWLTL)

Category: Access management

Study: Modeling and Evaluating the Safety Impacts of Access Management (AM) Features in the Las Vegas Valley, Mauga and Kaseko, 2010

Star Quality Rating: 4 Stars   [View score details]
Rating Points Total: 115
Crash Modification Factor (CMF)
Value: 0.53
Adjusted Standard Error:
Unadjusted Standard Error: 0.1473
Crash Reduction Factor (CRF)
Value: 47   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 14.73
Crash Type: Head on
Crash Severity: All
Roadway Types: All
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: 30
Maximum Speed Limit: 45
Speed Unit: mph
Speed Limit Comment:
Area Type:
Traffic Volume: Minimum of 4883 to Maximum of 96080 Annual Average Daily Traffic (AADT)
Average Traffic Volume:
Time of Day: Not specified
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: 2002 to 2006
State: NV
Type of Methodology Used: Regression cross-section
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Aug-11-2010