CMF / CRF Details

CMF ID: 4370

Increasing the outside shoulder width inside the work zone by one foot

Description: Increasing the outside shoulder width inside the work zone by one foot

Prior Condition: Regular traffic conditions without work zone

Category: Work zone

Study: Improving Safety in High-Speed Work Zones: A Super 70 Study, Tarko, Andrew P.; Bin Islam, Mouyid ; Thomaz, Jose E., 2011

 
Star Quality Rating: 3 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.948
Adjusted Standard Error:
Unadjusted Standard Error: 0.01
Crash Reduction Factor (CRF)
Value: 5.2   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 1
Applicability
Crash Type: All
Crash Severity: All
Roadway Types: Principal Arterial Interstate
Number of Lanes:
Road Division Type: Divided by Median
Speed Limit:
Area Type: Urban
Traffic Volume:
Average Traffic Volume:
Time of Day: Not specified
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 2008
Municipality: Indianapolis
State: IN
Country: USA
Type of Methodology Used: Regression cross-section
Sample Size (crashes): 1403 crashes
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-06-2012
Comments: CMF identified from Appendix H