CMF / CRF Details
CMF ID: 10074
Provide Truck Climbing Lane
Description: A climbing lane is an additional roadway lane used for short distances in certain uphill areas to enhance safety, mitigate congestion and prevent delays. It improves the mobility of large trucks along steep grades. These lanes also facilitate the passing of slow-moving heavy vehicles without slowing other traffic on the road.
Prior Condition: No Prior Condition(s)
Category: Roadway
Study: Evaluating Safety Effectiveness of Truck Climbing Lanes using Cross-Sectional Analysis and Proposensity Score Models, Haq et al., 2019
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 115 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.57 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 43 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | All |
| Roadway Types: | Principal Arterial Interstate |
| Street Type: | |
| Minimum Number of Lanes: | |
| Maximum Number of Lanes: | |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | Divided by Median |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | Not specified |
| 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: | 2008 to 2016 |
| Municipality: | |
| State: | WY |
| Country: | USA |
| Type of Methodology Used: | Regression cross-section |
| Sample Size (sites): | 118 sites |
| Sample Size (site-years): | 1062 site-years |
| Sample Size (miles): | 57 miles |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Jul 26, 2019 |
| Comments: | |
