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: |  [View score details] |
| Rating Points Total: | 120 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.52 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.06 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 48 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 6 |
| Applicability | |
|---|---|
| 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 | |
|---|---|
| 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 |
