CMF / CRF Details
CMF ID: 9406
Convert signal from span wire to mast arm
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
| Crash Modification Factor (CMF) |
|---|
| Value: | 0.97 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.137 |
| Crash Reduction Factor (CRF) |
|---|
| Value: | 3 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 13.7 |
| Applicability |
|---|
| Crash Type: | Angle |
| 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 (sites): | 30 sites before, 30 sites after |
| Sample Size (site-years): | 91 site-years before, 69 site-years after |
| Other Details |
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| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Oct 27, 2018 |
| Comments: | This CMF applies to KABC angle crashes at signalized intersections. The number of crashes in the after period were not reported in this study, however, they have been recorded as 300 to give 10 points as a beneift of doubt for one or more of the following: (1) number of miles/sites in the reference/treatment group, (2) number of crashes in the references/treatment group, (3) reporting AADTs for the aggregate dataset but not for the disaggragate dataset used for CMF development. |
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