CMF / CRF Details

CMF ID: 8855

Install Red-light indicator lights

Description: Red-light indicator lights are mounted on the signal head or on the mast arm. The indicator activates simultaneously with the red interval, allowing an enforcement officer downstream to identify if a vehicle has violated the red interval.

Prior Condition:  4-legged signalized intersection without RLIL

Category: Advanced technology and ITS

Study: Safety Evaluation of Red-Light Indicator Lights in Florida, Himes et al., 2017

 
Star Quality Rating:5 Stars  [View score details]
Rating Points Total:135
Crash Modification Factor (CMF)
Value:0.916
Adjusted Standard Error:
Unadjusted Standard Error:0.035
Crash Reduction Factor (CRF)
Value:8.4  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
Crash Type:All
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:
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Not specified
Traffic Volume:
Average Traffic Volume:
Time of Day:All
If countermeasure is intersection-based
Intersection Type:Roadway/roadway (not interchange related)
Intersection Geometry:4-leg
Traffic Control:Signalized
Major Road Traffic Volume:Minimum of 5900 to Maximum of 80500 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume:Minimum of 845 to Maximum of 62666 Annual Average Daily Traffic (AADT)
Average Major Road Volume :35841 Annual Average Daily Traffic (AADT)
Average Minor Road Volume :13934 Annual Average Daily Traffic (AADT)
Development Details
Date Range of Data Used:2003 to 2012
Municipality:
State:FL
Country:USA
Type of Methodology Used:Before/after using empirical Bayes or full Bayes
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Nov 17, 2017
Comments:Disaggregated CMF for total entering volume >=40,000 veh/day 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.