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U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation
OFFICE OF RESEARCH, DEVELOPMENT, AND TECHNOLOGY AT THE TURNER-FAIRBANK HIGHWAY RESEARCH CENTER

Safety Evaluation of Center Two-Way Left-Turn Lanes on Two-Lane Roads

Publication Information

Publication Type:
TechBrief
Publication Number:
FHWA-HRT-08-046
Abstract:

This document is a technical summary of the Federal Highway Administration report, "Safety Evaluation of Center Two-Way Left-Turn Lanes on Two-Lane Roads." The objective of this study was to evaluate the safety effectiveness of installing Two-Way Left-Turn Lanes (TWLTLs) on rural roads as measured by crash frequency before and after the installation of the TWLTLs. The study also examined the effects of this strategy on specific crash types; total, injury, and rear-end crashes were examined in a rigorous analysis, while a cursory analysis was performed for head-on, intersection, and nonintersection crashes. The results of the analysis indicate statistically significant reductions at the 95% confidence level in total, injury, and rear-end crashes for the combined results of the four states examined. Further results are discussed in this TechBrief.

Publishing Date:
March 2008
NTIS:
PB2008-110827
Publishing Office:
Office of Safety Research and Development
FHWA Program(s):
Safety
Research
AMRP Program(s):
Safety Data and Analysis
FHWA Activities:
Highway Safety Information System
Subject Area:
Safety and Human Factors