CMF / CRF Details
CMF ID: 2720
Implement truck lane restrictions on 2-lane directional interstate segments (screened)
Description:
Restrict trucks traveling 50 mph or below from the left lane on 2-lane directional interstate segments
Prior Condition: No truck lane restriction signs posted
Category: Roadway
| Crash Modification Factor (CMF) |
|---|
| Value: | 0.95 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.0867 |
| Crash Reduction Factor (CRF) |
|---|
| Value: | 5 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 8.67 |
| Applicability |
|---|
| Crash Type: | Truck related |
| Crash Severity: | All |
| Roadway Types: | Principal Arterial Interstate |
| Street Type: | |
| Minimum Number of Lanes: | 2 |
| Maximum Number of Lanes: | 2 |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | |
| Minimum Speed Limit: | 65 |
| Maximum Speed Limit: | 65 |
| Speed Unit: | mph |
| Speed Limit Comment: | |
| Area Type: | Not specified |
| Traffic Volume: | Minimum of 4056 to Maximum of 25281 Annual Average Daily Traffic (AADT) |
| Average Traffic Volume: | 16692 Annual Average Daily Traffic (AADT) |
| 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: | 2001 to 2007 |
| Municipality: | |
| State: | VA |
| Country: | USA |
| Type of Methodology Used: | Simple before/after |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Mar 21, 2011 |
| Comments: | A previously reviewed 2008 TRB paper (Fontaine, M.D. "Impact of Truck Lane Restrictions on Four-Lane Freeways in Mountainous Areas." TRB 87th Annual Meeting Compendium of Papers CD-ROM. Washington, D.C., 2008) also examined truck restrictions for interstates in western Virginia. However, the 2008 study did not screen truck-related crashes in the elaborate manner used in this report. This study screened out truck-related crashes which were deemed unrelated to the truck lane restrictions. Consequently, the two studies produce distinct CMFs and require separate entries. |
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