CMF / CRF Details

CMF ID: 8857

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: 0.873
Adjusted Standard Error:
Unadjusted Standard Error: 0.033
Crash Reduction Factor (CRF)
Value: 12.7   (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
Number of Lanes:
Road Division Type:
Speed Limit:
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: 2
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Nov-17-2017
Comments: Disaggregated CMF for 20% or more of total entering volume from minor approaches 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.