CMF / CRF Details
CMF ID: 8429
Improve angle of channelized right turn lane
Description: Changes made to the study approaches include: sharpening the flat approach angle typical in traditional designs, reducing the radius, adjusting the stop bar position, and modifying the corner island to increase the line of sight of approaching through traffic.
Prior Condition: Varied depending on intersection
Category: Intersection geometry
Study: Safety Impacts of a Modified Right Turn Lane Design at Intersections, Schattler and Hanson, 2016
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 105 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.564 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.161 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 43.6 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 16.1 |
| 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: | 1 |
| Maximum Number of Lanes: | 3 |
| 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: | Not specified |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | All |
| If countermeasure is intersection-based | |
| Intersection Type: | Roadway/roadway (not interchange related) |
| Intersection Geometry: | Not specified |
| Traffic Control: | Other |
| Major Road Traffic Volume: | |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details | |
|---|---|
| Date Range of Data Used: | 2003 to 2016 |
| Municipality: | Peoria |
| State: | IL |
| Country: | |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 64 crashes before, 39 crashes after |
| Sample Size (sites): | 7 sites before, 7 sites after |
| Sample Size (site-years): | 21 site-years before, 21 site-years after |
