CMF / CRF Details
CMF ID: 4887
Replace Night-Time Flash with Steady Operation
Description:
Prior Condition: Traffic signals were operating in the late night flash (LNF) mode from late night to early morning hours.
Category: Intersection traffic control
Study: Safety Evaluation of Discontinuing Late Night Flash Operations at Signalized Intersections, Lan and Srinivasan, 2013
Star Quality Rating: | ![]() |
Rating Points Total: | 120 |
Crash Modification Factor (CMF) | |
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Value: | 0.52 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.06 |
Crash Reduction Factor (CRF) | |
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Value: | 48 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 6 |
Applicability | |
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Crash Type: | All |
Crash Severity: | All |
Roadway Types: | All |
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: | All |
Traffic Volume: | |
Average Traffic Volume: | |
Time of Day: | Night |
If countermeasure is intersection-based | |
Intersection Type: | Not specified |
Intersection Geometry: | 3-leg,4-leg |
Traffic Control: | Signalized |
Major Road Traffic Volume: | Minimum of 2550 to Maximum of 59000 Annual Average Daily Traffic (AADT) |
Minor Road Traffic Volume: | Minimum of 1000 to Maximum of 23333 Annual Average Daily Traffic (AADT) |
Average Major Road Volume : | 21837 Annual Average Daily Traffic (AADT) |
Average Minor Road Volume : | 7955 Annual Average Daily Traffic (AADT) |
Development Details | |
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Date Range of Data Used: | 2000 to 2007 |
Municipality: | Statewide |
State: | NC |
Country: | USA |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (crashes): | 482 crashes before, 86 crashes after |