CMF / CRF Details

CMF ID: 7939

Increase from 4 lanes to 6 lanes

Description:

Prior Condition: 4 lane roadway with LOS D

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: 3 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.868
Adjusted Standard Error:
Unadjusted Standard Error: 0.175
Crash Reduction Factor (CRF)
Value: 13.2   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 17.5
Applicability
Crash Type: All
Crash Severity: K (fatal),A (serious injury),B (minor injury),C (possible injury)
Roadway Types: Not specified
Number of Lanes:
Road Division Type:
Speed Limit: 40-60
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 (sites): 48 sites before
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Mar-08-2016
Comments: LOS change from D (4 lanes) to D (6 lanes)