CMF / CRF Details

CMF ID: 7831

Decrease paved right shoulder from 8-ft to X

Description:

Prior Condition: Roadway with 8-ft right paved shoulders

Category: Shoulder treatments

Study: Validation and Application of Highway Safety Manual (Part D) in Florida, Abdel-Aty et al., 2014

 
Star Quality Rating: 2 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 1.35
Adjusted Standard Error:
Unadjusted Standard Error: 0.06
Crash Reduction Factor (CRF)
Value: -35   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 6
Applicability
Crash Type: All
Crash Severity: All
Roadway Types: Not specified
Number of Lanes: >2
Road Division Type: All
Speed Limit:
Area Type: Rural
Traffic Volume: Minimum of 5000 to Maximum of 35000 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: 2010 to 2012
Municipality:
State: FL
Country: USA
Type of Methodology Used: Regression cross-section
Sample Size (sites): 317 sites
Sample Size (site-years): 951 site-years
Sample Size (miles): 135.326 miles
Sample Size (mile-years): 406 mile-years
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Mar-08-2016
Comments: CMFs of narrowing paved right shoulder width from 8-ft to 4-ft on rural multilane highways.