CMF / CRF Details

CMF ID: 6683

Pave shoulder


Prior Condition: Deteriorated shoulder

Category: Shoulder treatments

Study: Safety Impacts of Highway Shoulder Attributes in Illinois, Bamzai et al., 2011

Star Quality Rating: 3 Stars   [View score details]
Rating Points Total: 75
Crash Modification Factor (CMF)
Value: 0.77
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value: 23   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Type: Fixed object,Head on,Run off road,Sideswipe
Crash Severity: K (fatal)
Roadway Types: Principal Arterial Interstate
Street Type:
Minimum Number of Lanes:
Maximum Number of Lanes:
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather: Not specified
Road Division Type: Divided by Median
Minimum Speed Limit: 65
Maximum Speed Limit: 65
Speed Unit: mph
Speed Limit Comment:
Area Type: Rural
Traffic Volume: Maximum of 30000 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 : NULL Annual Average Daily Traffic (AADT)
Average Minor Road Volume : NULL Annual Average Daily Traffic (AADT)
Development Details
Date Range of Data Used: 2000 to 2006
State: IL
Country: USA
Type of Methodology Used: Before/after using empirical Bayes or full Bayes
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Jun-22-2015
Comments: This CMF applies to rural interstates with less than or equal to 30,000 vehicles per day. Crash types include head-on, sideswipe same direction (for multilane highways), sideswipe opposite direction, fixed object, and overturn in road or roadside