CMF / CRF Details
CMF ID: 8934
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
Study: Safety Effects of Low-Cost Systemic Safety Improvements at Signalized and Stop-Controlled Intersections, Le et al., 2017
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 95 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 1.06 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.097 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | -6 (This value indicates an increase in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 9.7 |
| 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: | Rural |
| 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 | |
|---|---|
| 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): | 26 sites before, 26 sites after |
