CMF / CRF Details
CMF ID: 7796
10-ft to 20-ft conversion (median width)
Description: Conversion of 10-ft traversible median to 20-ft traversible median on rural four-lane road with full access control
Prior Condition: Roadway with a 10ft median
Category: Access management
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: | 80 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.98 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.01 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 2 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 1 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | All |
| Roadway Types: | Not specified |
| Street Type: | |
| Minimum Number of Lanes: | 4 |
| Maximum Number of Lanes: | |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | > = 4 Lanes |
| Crash Weather: | Not specified |
| Road Division Type: | Divided by Median |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Urban |
| Traffic Volume: | Minimum of 18900 to Maximum of 158000 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 (sites): | 143 sites |
| Sample Size (site-years): | 429 site-years |
| Sample Size (miles): | 123.65 miles |
| Sample Size (mile-years): | 371 mile-years |
