CMF / CRF Details
Provide a raised median
Countermeasure ID: 5117
Description:
Prior Condition: Two-way left-turn lane
Category: Access management
Study: Before-and-after safety study of roadways Where new medians have been added, Alluri et al., 2012
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 40 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.416 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.143 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 58.4 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 14.3 |
| Applicability | |
|---|---|
| Crash Type: | Nighttime |
| Crash Severity: | All |
| Roadway Types: | Principal Arterial Other |
| Street Type: | |
| Minimum Number of Lanes: | 6 |
| Maximum Number of Lanes: | 6 |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | Divided by TWLTL |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Urban and suburban |
| Traffic Volume: | Minimum of 26224 to Maximum of 57000 Annual Average Daily Traffic (AADT) |
| Average Traffic Volume: | |
| Time of Day: | Night |
| 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: | 2003 to 2010 |
| Municipality: | |
| State: | FL |
| Country: | USA |
| Type of Methodology Used: | Simple before/after |
| Sample Size (crashes): | 29 crashes before, 12 crashes after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Aug 01, 2013 |
| Comments: | |
