CMF / CRF Details
CMF ID: 9600
Change urban or suburban roadway cross-section
Description: Add or reduce the number of through lanes and/or add or remove a two-way left-turn lane to an urban or suburban roadway
Prior Condition: Commercial driveway access to two-lane undivided roadway
Category: Roadway
Study: Safety Effects of Different Driveway Types Defined in Highway Safety Manual, Williamson et al., 2018
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 40 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 2.019 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | -101.9 (This value indicates an increase in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Applicability | |
|---|---|
| Crash Type: | Angle,Fixed object,Left turn,Rear end,Sideswipe,Vehicle/bicycle,Vehicle/pedestrian |
| Crash Severity: | O (property damage only) |
| Roadway Types: | Not specified |
| Street Type: | |
| Minimum Number of Lanes: | 2 |
| Maximum Number of Lanes: | 2 |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | Undivided |
| Minimum Speed Limit: | 35 |
| Maximum Speed Limit: | 40 |
| Speed Unit: | mph |
| Speed Limit Comment: | |
| Area Type: | Urban and suburban |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | All |
| 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: | 2005 to 2009 |
| Municipality: | |
| State: | IL |
| Country: | United States |
| Type of Methodology Used: | Regression cross-section |
