CMF / CRF Details

CMF ID: 2225

Implement truck lane restrictions on 4-lane freeways

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: 25
Crash Modification Factor (CMF)
Value: 0.89
Adjusted Standard Error:
Unadjusted Standard Error: 0.087
Crash Reduction Factor (CRF)
Value: 11   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 8.7
Crash Type: All
Crash Severity: All
Roadway Types: Principal Arterial Other Freeways and Expressways
Number of Lanes: 4
Road Division Type:
Speed Limit:
Area Type:
Traffic Volume: Minimum of 4041 to Maximum of 24361 Average Daily Traffic (ADT)
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: 3
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-01-2009
Comments: Only for truck-related crashes.