CMF / CRF Details

CMF ID: 2115

Convert continuous access HOV lanes to limited-access (HOV and left lane crashes)


Prior Condition:  freeway with HOV lane

Category: Roadway

Study: Safety Performance of High-Occupancy-Vehicle Facilities: Evaluation of HOV Lane Configurations in California, Jang et al., 2009

Star Quality Rating:1 Star  [View score details]
Rating Points Total:30
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:1.957
Crash Reduction Factor (CRF)
Value:-19.6  (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:195.7
Crash Type:All
Crash Severity:K (fatal),A (serious injury)
Roadway Types:Principal Arterial Interstate
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:
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:1999 to 2003
Type of Methodology Used:Non-regression cross-section
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Dec 01, 2009
Comments:Only for HOV and left-lane crashes. The authors initially released this CMF in a paper presented at the 2009 TRB Annual Meeting. The subsequent publication in Transportation Research Record 2099 has corrected values. This entry reflects the corrected values from the TRR.