CMF / CRF Details
Convert signal from span wire to mast arm
Countermeasure ID: 9405
Description: Convert signals mounted on span wire to signals mounted on mast arm
Prior Condition: Signalized intersection with signals mounted on span wire.
Category: Intersection traffic control
Study: Evaluating the Safety Effects of Span Wire to Mast Arm Signal Conversion, Khattak and Fontaine, 2018
Study Type: Conference Paper
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 80 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.98 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.119 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 2 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 11.9 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
| Roadway Types: | Not specified |
| 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: | |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | All |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | All |
| If countermeasure is intersection-based | |
| Intersection Type: | Not specified |
| Intersection Geometry: | 3-leg,4-leg |
| Traffic Control: | Signalized |
| Major Road Traffic Volume: | Minimum of 2874 to Maximum of 46185 Annual Average Daily Traffic (AADT) |
| Minor Road Traffic Volume: | Minimum of 476 to Maximum of 31443 Annual Average Daily Traffic (AADT) |
| Average Major Road Volume : | 19156 Annual Average Daily Traffic (AADT) |
| Average Minor Road Volume : | 6502 Annual Average Daily Traffic (AADT) |
| Development Details | |
|---|---|
| Date Range of Data Used: | |
| Municipality: | |
| State: | VA |
| Country: | United States |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 212 crashes before, 112 crashes after |
| Sample Size (sites): | 30 sites before, 30 sites after |
| Sample Size (site-years): | 91 site-years before, 69 site-years after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Oct 27, 2018 |
| Comments: | This CMF applies to all KABC crashes at signalized intersections. |
