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)
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
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.