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

Study: Evaluation of Truck Lane Restrictions in Virginia: Phase II, Fontaine et al., 2009

Star Quality Rating: 1 Star   [View score details]
Rating Points Total: 30
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
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
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.