CMF / CRF Details

CMF ID: 6915

Flatten side slopes


Prior Condition: Traversable median with unspecific sideslope ratio

Category: Roadside

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

Star Quality Rating: 2 Stars   [View score details]
Rating Points Total: 60
Crash Modification Factor (CMF)
Value: 0.892
Adjusted Standard Error:
Unadjusted Standard Error: 0.062
Crash Reduction Factor (CRF)
Value: 10.8   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 6.2
Crash Type: Cross median,Fixed object,Run off road,Other
Crash Severity: K (fatal),A (serious injury),B (minor injury),C (possible injury)
Roadway Types: Not specified
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: 2001 to 2005
State: WA
Country: USA
Type of Methodology Used: 7
Sample Size (miles): 24 miles
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Nov-01-2015
Comments: This CMF applies to a unit decrease in median slope ratio for median-related crashes on four-lane non-freeways with a traversable median. Median related crashes include rollover crashes in the median, non-barrier fixed object crashes, crash-involved vehicle comes to a rest in the median, vehicle departs and returns to original traveled way, and cross-median crashes.