CMF / CRF Details
Increase separation distance between driveway exit and downstream U-turn by 10% (m)
Countermeasure ID: 2216
Description:
Prior Condition: No Prior Condition(s)
Category: Access management
Study: Impacts of Separation Distance between Driveway Exist and Downstream U-turn Locations on the Safety Performance of Right-turns Followed by U-turns, Liu et al., 2008
| Crash Modification Factor (CMF) |
|---|
| Value: | 0.967 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.0118 |
| Crash Reduction Factor (CRF) |
|---|
| Value: | 3.3 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 1.18 |
| Applicability |
|---|
| Crash Type: | All |
| 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: | |
| Minimum Speed Limit: | 50 |
| Maximum Speed Limit: | 55 |
| Speed Unit: | mph |
| Speed Limit Comment: | |
| Area Type: | |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | All |
| If countermeasure is intersection-based |
| Intersection Type: | |
| Intersection Geometry: | |
| Traffic Control: | |
| Major Road Traffic Volume: | Minimum of 18200 to Maximum of 86300 Average Daily Traffic (ADT) |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details |
|---|
| Date Range of Data Used: | 2003 to 2005 |
| Municipality: | |
| State: | FL |
| Country: | |
| Type of Methodology Used: | Regression cross-section |
| Sample Size (site-years): | 280 site-years |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Dec 01, 2009 |
| Comments: | |
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