CMF / CRF Details

CMF ID: 6129

Install cable median barrier

Description: Install cable median barrier

Prior Condition: No cable median barrier installed

Category: Roadside

Study: Effectiveness of various safety improvements in reducing crashes on Wyoming roadways, Zebulon C. Coulter Khaled Ksaibati, 2013

Star Quality Rating: 3 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.79
Adjusted Standard Error:
Unadjusted Standard Error: 0.06
Crash Reduction Factor (CRF)
Value: 21   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 6
Crash Type: Other
Crash Severity: K (fatal),A (serious injury),B (minor injury),C (possible injury)
Roadway Types: Principal Arterial Interstate
Number of Lanes:
Road Division Type: Divided by Median
Speed Limit:
Area Type: Rural
Traffic Volume: Minimum of 7000 to Maximum of 13,500 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: 2006 to 2010
State: WY
Country: USA
Type of Methodology Used: Simple before/after
Sample Size (crashes): 406 crashes before, 320 crashes after
Sample Size (sites): 5 sites before, 5 sites after
Sample Size (site-years): 10 site-years before, 10 site-years after
Sample Size (miles): 103 miles before, 103 miles after
Sample Size (miles): 206 mile-years before, 206 mile-years after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Mar-11-2015
Comments: K+ A + B + C injuries."Median" crashes, but not "cross median". Includes rollover, hitting the cable median barrier, and all other fixed objects the median