CMF / CRF Details

CMF ID: 2993

Convert High-Occupancy-Vehicle (HOV) lanes to High-Occupancy-Toll (HOT) lanes

Description: convert a High-Occupancy-Vehicle (HOV) interstate segment into a High-Occupancy-Toll (HOT) segment

Prior Condition: High-Occupancy-Vehicle (HOV) interstate segment

Category: Roadway

Study: Safety Benefits of Converting HOV lanes to HOT lanes: Case Study of the I-394 MnPass, Cao et al., 2011

 
Star Quality Rating: 3 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.89
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value: 11   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
Crash Type: All
Crash Severity: O (property damage only)
Roadway Types: Principal Arterial Interstate
Number of Lanes:
Road Division Type: Divided by Median
Speed Limit:
Area Type: Urban
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: 1998 to 2008
Municipality: Minneapolis-St. Paul
State: MN
Country: U.S.A.
Type of Methodology Used: Simple before/after
Sample Size (crashes): 1504 crashes before, 569 crashes after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Jul-15-2011
Comments: This CMF was derived from a comparison group study, but the method does not follow Hauer's book. Data on traffic volumes, speed limits, and thru lanes are not provided. The authors only have crash and volume data for every other year.