CMF / CRF Details
CMF ID: 4710
Road diet (Convert 4-lane undivided road to 2-lanes plus turning lane), target crashes
Description: Road diets (4 to 3 lane), target crashes
Prior Condition: 4 lane road
Category: Roadway
Study: Safety and Operational Analysis of 4-lane to 3-lane Conversions (Road Diets) in Michigan, Lyles et al., 2012
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 50 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.59 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.061 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 41 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 6.1 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | All |
| Roadway Types: | Not specified |
| Street Type: | |
| Minimum Number of Lanes: | 3 |
| 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: | |
| Traffic Volume: | Minimum of 3510 to Maximum of 17020 Average Daily Traffic (ADT) |
| Average Traffic Volume: | 10652 Average Daily Traffic (ADT) |
| Time of Day: | |
| If countermeasure is intersection-based | |
| Intersection Type: | |
| Intersection Geometry: | |
| Traffic Control: | |
| Major Road Traffic Volume: | |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details | |
|---|---|
| Date Range of Data Used: | 1995 to 2010 |
| Municipality: | |
| State: | MI |
| Country: | |
| Type of Methodology Used: | Simple before/after |
| Sample Size (site-years): | 72 site-years before, 72 site-years after |
