CMF / CRF Details

CMF ID: 8822

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: 4 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.6
Adjusted Standard Error:
Unadjusted Standard Error: 0.041
Crash Reduction Factor (CRF)
Value: 40   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
Crash Type: Left turn
Crash Severity: All
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: Before/after using empirical Bayes or full Bayes
Sample Size (crashes): 358 crashes before, 305 crashes after
Sample Size (sites): 108 sites before, 108 sites after
Sample Size (site-years): 365 site-years before, 599 site-years after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Nov-17-2017
Comments: