CMF / CRF Details
CMF ID: 2226
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: | [View score details] |
Rating Points Total: | 35 |
Crash Modification Factor (CMF) | |
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Value: | 0.68 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.177 |
Crash Reduction Factor (CRF) | |
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Value: | 32 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 17.7 |
Applicability | |
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Crash Type: | All |
Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
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 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 | |
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Date Range of Data Used: | 2001 to 2006 |
Municipality: | |
State: | VA |
Country: | |
Type of Methodology Used: | Simple before/after |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Dec 01, 2009 |
Comments: | Only for truck-related crashes. |