CMF / CRF Details

CMF ID: 2227

Implement truck lane restrictions on 4-lane freeways (truck crashes)

Description: Restrict trucks traveling more than 15 mph below posted speed from the left lane on 4-lane interstate segments.

Prior Condition: No Prior Condition(s)

Category: Roadway

Study: Impact of Truck Lane Restrictions on Four-Lane Freeways in Mountainous Areas, Fontaine, 2008

Star Quality Rating: 1 Star   [View score details]
Rating Points Total: 20
Crash Modification Factor (CMF)
Value: 1.12
Adjusted Standard Error:
Unadjusted Standard Error: 0.189
Crash Reduction Factor (CRF)
Value: -12   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 18.9
Crash Type: All
Crash Severity: All
Roadway Types: Principal Arterial Other Freeways and Expressways
Street Type:
Minimum Number of Lanes: 4
Maximum Number of Lanes: 4
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather: Not specified
Road Division Type:
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:
Traffic Volume: Minimum of 4041 to Maximum of 24361 Annual Average Daily Traffic (AADT)
Average Traffic Volume:
Time of Day: All
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 2006
State: VA
Type of Methodology Used: Simple before/after
Sample Size (site-years): 114 site-years before, 114 site-years after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-01-2009