CMF / CRF Details
CMF ID: 4911
Install a "Vehicles Entering When Flashing" (VEWF) system (overhead signs at intersection on minor and loops on major)
Description:
Safety effectiveness of "Vehicle Entering When Flashing" (VEWF) intersection conflict warning systems at stop-controlled intersections
Prior Condition: stop-controlled
Category: Signs
| Crash Modification Factor (CMF) |
|---|
| Value: | 0.95 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.084 |
| Crash Reduction Factor (CRF) |
|---|
| Value: | 5 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 8.4 |
| Applicability |
|---|
| Crash Type: | All |
| Crash Severity: | All |
| Roadway Types: | Not specified |
| Street Type: | |
| Minimum Number of Lanes: | 2 |
| Maximum Number of Lanes: | 2 |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | |
| Minimum Speed Limit: | 45 |
| Maximum Speed Limit: | 55 |
| Speed Unit: | mph |
| Speed Limit Comment: | |
| Area Type: | All |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | |
| If countermeasure is intersection-based |
| Intersection Type: | Roadway/roadway (not interchange related) |
| Intersection Geometry: | 4-leg |
| Traffic Control: | Stop-controlled |
| Major Road Traffic Volume: | Minimum of 3000 to Maximum of 30000 Annual Average Daily Traffic (AADT) |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details |
|---|
| Date Range of Data Used: | 1996 to 2010 |
| Municipality: | |
| State: | NC |
| Country: | |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 264 crashes after |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Aug 01, 2013 |
| Comments: | A linear assumption was used to account for changes in traffic volume at the treatment sites (instead of SPFs). |
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