CMF / CRF Details

CMF ID: 6977

Increase Median Width

Description: Increase median width

Prior Condition: Median of unspecified width with barrier

Category: Roadside

Study: NCHRP Report 794: Median Cross-Section Design for Rural Divided Highways, Graham et al., 2014

 
Star Quality Rating: 4 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.995
Adjusted Standard Error:
Unadjusted Standard Error: 0.001
Crash Reduction Factor (CRF)
Value: 0.47   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 0.1
Applicability
Crash Type: Cross median,Fixed object,Run off road,Other
Crash Severity: All
Roadway Types: Principal Arterial Other Freeways and Expressways
Number of Lanes: 4
Road Division Type: Divided by Median
Speed Limit:
Area Type: Rural
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: 2000 to 2007
Municipality:
State: CA, MO, NC, OH, PA, WA
Country: USA
Type of Methodology Used: Regression cross-section
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Nov-01-2015
Comments: This CMF applies to increasing median width by one foot for median-related crashes on four-lane freeways with flexible median barriers. Median-related crashes include hit barrier, cross-median crash, non-collision cross-median crash, rollover, fixed-object, and other median related.