CMF / CRF Details

CMF ID: 7924

Increase from 4 lanes to 6 lanes

Description:

Prior Condition: 4 lane roadway

Category: Roadway

Study: Assessment of safety effects for widening urban roadways in developing crash modification functions using nonlinearizing link functions, Park et al., 2015

 
Star Quality Rating: 5 Stars   [View score details]
Rating Points Total: 135
Crash Modification Factor (CMF)
Value: 0.85
Adjusted Standard Error:
Unadjusted Standard Error: 0.073
Crash Reduction Factor (CRF)
Value: 15   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 7.3
Applicability
Crash Type: All
Crash Severity: All
Roadway Types: Not specified
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:
Minimum Speed Limit: 40
Maximum Speed Limit: 60
Speed Unit: mph
Speed Limit Comment:
Area Type: Urban
Traffic Volume: Minimum of 20500 to Maximum of 60683 Annual Average Daily Traffic (AADT)
Average Traffic Volume:
Time of Day:
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: 2003 to 2012
Municipality:
State: FL
Country:
Type of Methodology Used: Before/after using empirical Bayes or full Bayes
Sample Size (crashes): 287 crashes before, 245 crashes after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Mar-08-2016
Comments: