CMF / CRF Details

CMF ID: 9848

Install cable median barrier

Description: Install cable median barrier

Prior Condition: No barrier present in median

Category: Roadside

Study: In-Service Performance Evaluation of Median Cable Barriers in Iowa, Savolainen et al., 2018

Star Quality Rating: 3 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.74
Adjusted Standard Error:
Unadjusted Standard Error: 0.08
Crash Reduction Factor (CRF)
Value: 26   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 8
Crash Type: Cross median
Crash Severity: B (minor injury)
Roadway Types: Principal Arterial Interstate
Number of Lanes:
Road Division Type: Divided by Median
Speed Limit:
Area Type: Not specified
Traffic Volume: Minimum of 4792 to Maximum of 85177 Annual Average Daily Traffic (AADT)
Average Traffic Volume: 27334 Annual Average Daily Traffic (AADT)
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: 2007 to 2015
State: IA
Country: USA
Type of Methodology Used: Regression cross-section
Sample Size (sites): 1259 sites
Sample Size (site-years): 11331 site-years
Sample Size (miles): 931.5 miles
Sample Size (mile-years): 8383.5 mile-years
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Nov-19-2018
Comments: Applies to cross-median crashes not involving animals.