CMF / CRF Details

CMF ID: 6980

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: 3 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.987
Adjusted Standard Error:
Unadjusted Standard Error: 0.006
Crash Reduction Factor (CRF)
Value: 1.27   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 0.6
Applicability
Crash Type: 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 2004
Municipality:
State: NC
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 hit barrier crashes on four-lane freeways with semi-rigid median barriers.