CMF / CRF Details
Convert 12-foot lanes to 9-foot or less
Countermeasure ID: 7823
Description: Convert 12-foot lanes to 9-foot or less
Prior Condition: Roadway with 12-foot lanes
Category: Roadway
Study: Validation and Application of Highway Safety Manual (Part D) in Florida, Abdel-Aty et al., 2014
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 85 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.44 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.16 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 56 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 16 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | All |
| Roadway Types: | Not specified |
| Street Type: | |
| Minimum Number of Lanes: | 2 |
| Maximum Number of Lanes: | |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | > = 2 Lanes |
| Crash Weather: | Not specified |
| Road Division Type: | Divided by Median |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Rural |
| Traffic Volume: | Minimum of 1600 to Maximum of 139000 Annual Average Daily Traffic (AADT) |
| 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: | 2010 to 2012 |
| Municipality: | |
| State: | FL |
| Country: | USA |
| Type of Methodology Used: | Regression cross-section |
| Sample Size (crashes): | 678 crashes |
| Sample Size (sites): | 415 sites |
| Sample Size (site-years): | 1245 site-years |
| Sample Size (miles): | 262.72 miles |
| Sample Size (mile-years): | 788 mile-years |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Mar 08, 2016 |
| Comments: | The speed limit here is the average speed limit. |
