CMF / CRF Details

CMF ID: 9380

Implement truck lane restrictions

Description: TLR prohibit semi- trucks (trucks) from using the left-5 most freeway lane, or inner lane, except in passing or emergency maneuvers.

Prior Condition: Roadway without Traffic Lane Restrictions

Category: Roadway

Study: Safety Performance of Truck Lane Restrictions in Texas: Empirical Bayes Observational Before-After Analysis, Das et al., 2018

 
Star Quality Rating: 2 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 1.17
Adjusted Standard Error:
Unadjusted Standard Error: 0.36623
Crash Reduction Factor (CRF)
Value: -17   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 36.623
Applicability
Crash Type: Truck related
Crash Severity: K (fatal),A (serious injury),B (minor injury),C (possible injury)
Roadway Types: Not specified
Number of Lanes: 8
Road Division Type: Divided by Median
Speed Limit:
Area Type:
Traffic Volume:
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: 2011 to 2015
Municipality: Dallas-Fort Worth
State: TX
Country:
Type of Methodology Used: Before/after using empirical Bayes or full Bayes
Sample Size (sites): 16 sites before, 16 sites after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Oct-27-2018
Comments: This CMF is for large truck involved fatal and injury crashes on eight-lane roadways.