Design criteria for median turn lanes.
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1978-03-01
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Abstract:This study was initiated with an extensive literature review and survey of
left-turn median lane practices in Texas cities. The initial phase identified
characteristics of urban arterial accidents, basic design elements, current use of
left-turn lanes, and existing guidelines for left-turn installations. Various
study methods for the investigations of operational and accident characteristics
were reviewed. One-way analysis of variance and multiple regression techniques
were adopted for segments of the analysis. Data were collected, primarily for continuous
two-way left-turn median lanes and raised channelized one-way left-turn
median lanes, and analyzed through tabulation of accident contributing factors,
lateral placement of vehicles in left-turn lane, entering and maneuvering distance
in left-turn lane, and other pertinent factors.
An equation and an accident prediction table for CTWLTML's were developed and
evaluation guidelines prepared. Based on the study, the utility of left-turn
median lanes is substantiated and they are recommended for implementation where
appropriate investigation indicates effectiveness. The guidelines contained in
this study report are proposed to complement currently acceptable practices,
thereby adding to the user confidence of these practices.
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