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THE EFFECTS OF THE TWO-WAY LEFT-TURN LANE ON ACCIDENTS IN THE SIX COUNTY AREA

Amie Nicholas

Open publisher page 1 citations

Abstract

This report summarizes the effect of a two-way left-turn lane (TWLTL) on affected accidents and total accident rates after installation on a given section of roadway in the six county area. Examination of these two measures will make it possible to determine the safety effectiveness of the TWLTL in reducing total accident rates and affected accident rates in the Chicago area. The evaluation methodology is described, and the findings are reported. Based on the limited number of 2-way left-turn lane segments available for this study, the overall effect of the TWLTL in the area seems positive. In four out of five segments analyzed, the accident rate dropped after the TWLTL was installed. In the remaining segment, the accident rate peaked during the first 18 months after the TWLTL installation, and dropped gradually to below the accident rate prior to its installation. Land use effects, and the effect of familiarity with the TWLTL use is also discussed.

About this research paper

What this paper is about

This report summarizes the effect of a two-way left-turn lane (TWLTL) on affected accidents and total accident rates after installation on a given section of roadway in the six county area. Examination of these two measures will make it possible to determine the safety effectiveness of the TWLTL in reducing total accident rates and affected accident rates in the Chicago area. The evaluation methodology is described, and the findings are reported. Based on the limited number of 2-way left-turn lane segments available for this study, the overall effect of the TWLTL in the area seems positive. In four out of five segments analyzed, the accident rate dropped after the TWLTL was installed. In the remaining segment, the accident rate peaked during the first 18 months after the TWLTL installation, and dropped gradually to below the accident rate prior to its installation. Land use effects, and the effect of familiarity with the TWLTL use is also discussed.

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Available abstract

This report summarizes the effect of a two-way left-turn lane (TWLTL) on affected accidents and total accident rates after installation on a given section of roadway in the six county area. Examination of these two measures will make it possible to determine the safety effectiveness of the TWLTL in reducing total accident rates and affected accident rates in the Chicago area. The evaluation methodology is described, and the findings are reported. Based on the limited number of 2-way left-turn lane segments available for this study, the overall effect of the TWLTL in the area seems positive. In four out of five segments analyzed, the accident rate dropped after the TWLTL was installed. In the remaining segment, the accident rate peaked during the first 18 months after the TWLTL installation, and dropped gradually to below the accident rate prior to its installation. Land use effects, and the effect of familiarity with the TWLTL use is also discussed.

Key concepts: Accident (philosophy), Road accident, Transport engineering, Forensic engineering, Engineering, Epistemology, Philosophy

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