CMF / CRF Details

CMF ID: 7866

Install red-light cameras

Description: RLR enforcement cameras

Prior Condition:  Signalized intersections without red-light cameras

Category: Advanced technology and ITS

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]
Rating Points Total:45
Crash Modification Factor (CMF)
Value:1.08
Adjusted Standard Error:
Unadjusted Standard Error:0.1
Crash Reduction Factor (CRF)
Value:-8  (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:10
Applicability
Crash Type:Rear end
Crash Severity:K (fatal),A (serious injury),B (minor injury),C (possible injury)
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:All
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Urban
Traffic Volume:
Average Traffic Volume:
Time of Day:All
If countermeasure is intersection-based
Intersection Type:
Intersection Geometry:No values chosen.
Traffic Control:Signalized
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 2011
Municipality:
State:FL
Country:USA
Type of Methodology Used:Before/after using empirical Bayes or full Bayes
Sample Size (sites):25 sites before, 25 sites after
Sample Size (site-years):75 site-years before, 75 site-years after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Mar 08, 2016
Comments:CMFs of rear-end crashes on all approaches of the adjacent intersections without red-light cameras The number of crashes in the after period were not reported in this study, however, they have been recorded as 300 to give 10 points as a beneift of doubt for one or more of the following: (1) number of miles/sites in the reference/treatment group, (2) number of crashes in the references/treatment group, (3) reporting AADTs for the aggregate dataset but not for the disaggragate dataset used for CMF development.