CMF / CRF Details

CMF ID: 5445

Install cable median barrier

Description: Install cable median barrier

Prior Condition: No Cable Median Barrier

Category: Roadside

Study: Cable Median Barrier Program in Washington State, Olson et al. 2013, 2013

Star Quality Rating: 3 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.35
Adjusted Standard Error:
Unadjusted Standard Error: 0.037
Crash Reduction Factor (CRF)
Value: 65   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 3.7
Crash Type: Cross median
Crash Severity: All
Roadway Types: Principal Arterial Other Freeways and Expressways
Number of Lanes:
Road Division Type: Divided by Median
Speed Limit:
Area Type: Not specified
Traffic Volume: Minimum of 10000 to Maximum of 180000 Annual Average Daily Traffic (AADT)
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: 1995 to 2011
State: WA
Country: USA
Type of Methodology Used: Simple before/after
Sample Size (crashes): 305 crashes before, 132 crashes after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Apr-30-2014
Comments: CMF for all cross-median related crashes; Cable median barrier includes generic cable median, 3-strand high-tension cable, and 4-strand high-tension cable