CMF / CRF Details
CMF ID: 8956
Implement systemic signing and visibility improvements at signalized intersections
Description:
Replace all signal heads.
Replace pedestrian signal heads, pushbuttons, and signs.
Install backplates with retroreflective borders on all signal heads.
Re-stripe stop lines.
Re-stripe crosswalks.
Install advance warning signs.
Install overhead signs (e.g., R10‐12, R3‐5L, R3‐5R in the MUTCD(4)).
Install curb ramps.
Prior Condition: Signalized intersection without systemic signing and visibility improvements
Category: Intersection traffic control
| Crash Modification Factor (CMF) |
|---|
| Value: | 0.98 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.052 |
| Crash Reduction Factor (CRF) |
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| Value: | 2 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 5.2 |
| Applicability |
|---|
| Crash Type: | Nighttime |
| Crash Severity: | All |
| Roadway Types: | All |
| Street Type: | |
| Minimum Number of Lanes: | 2 |
| Maximum Number of Lanes: | 4 |
| 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: | Night |
| If countermeasure is intersection-based |
| Intersection Type: | |
| Intersection Geometry: | 3-leg,4-leg |
| Traffic Control: | Signalized |
| Major Road Traffic Volume: | Minimum of 4272 to Maximum of 41100 Annual Average Daily Traffic (AADT) |
| Minor Road Traffic Volume: | Minimum of 111 to Maximum of 20000 Annual Average Daily Traffic (AADT) |
| Average Major Road Volume : | 20447 Annual Average Daily Traffic (AADT) |
| Average Minor Road Volume : | 5864 Annual Average Daily Traffic (AADT) |
| Development Details |
|---|
| Date Range of Data Used: | 2005 to 2014 |
| Municipality: | |
| State: | SC |
| Country: | |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (sites): | 64 sites before, 64 sites after |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Nov 17, 2017 |
| Comments: | CMF for 4 mainline lanes and 2 cross street lanes 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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