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Abstract
This paper discusses the benefits to intersection safety of offsetting left-turn lanes by widening the
width of the lane-line marking between the left-turn lanes and their adjacent through lanes. The
analysis was performed using an empirical Baye’s procedure in order to account for potential bias
due to regression-to-the-mean. Results from the analysis of 12 treated intersection approaches and
36 non-treated approaches in Lincoln, Nebraska, suggest statistically significant improvements in
safety at the treated intersections.