CMF / CRF Details
Implement systemic signing and visibility improvements at signalized intersections
Countermeasure ID: 8924
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
Study: Safety Effects of Low-Cost Systemic Safety Improvements at Signalized and Stop-Controlled Intersections, Le et al., 2017
| Crash Modification Factor (CMF) |
|---|
| Value: | 0.974 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.034 |
| Crash Reduction Factor (CRF) |
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| Value: | 2.6 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 3.4 |
| Applicability |
|---|
| Crash Type: | Rear end |
| 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: | All |
| 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 |
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| 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 (crashes): | 2136 crashes before, 1349 crashes after |
| Sample Size (sites): | 84 sites before, 84 sites after |
| Sample Size (site-years): | 411 site-years before, 209 site-years after |
| Other Details |
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| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Nov 17, 2017 |
| Comments: | |
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