CMF / CRF Details

CMF ID: 6812

Pave shoulder

Description:

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:1.1
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value:-10  (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
Crash Type:Fixed object,Head on,Run off road,Sideswipe
Crash Severity:K (fatal)
Roadway Types:Not specified
Street Type:
Minimum Number of Lanes:2
Maximum Number of Lanes:2
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Undivided
Minimum Speed Limit:45
Maximum Speed Limit:55
Speed Unit:mph
Speed Limit Comment:
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 :NULL
Average Minor Road Volume :NULL
Development Details
Date Range of Data Used:2000 to 2006
Municipality:
State:IL
Country:USA
Type of Methodology Used:Before/after using empirical Bayes or full Bayes
Sample Size (crashes):NULL crashes
Sample Size (sites):NULL sites
Sample Size (site-years):NULL site-years
Sample Size (miles):NULL miles
Sample Size (mile-years):NULL mile-years
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Jun 22, 2015
Comments:This CMF applies to rural two-lane highways with a combined lane width and outside paved shoulder width greater than 20 ft. Crash types include head-on, sideswipe same direction (for multilane highways), sideswipe opposite direction, fixed object, and overturn in road or roadside