Evaluation of New Lane Reduction Markings

Abstract

Roadway lane reduction transitions have long been reported to be problematic to drivers. It is not known whether this is the result of a lack of understanding of lane reduction markings, a simple failure to comply with such markings, or other unknown factors. This study explored driver comprehension of six different lane reduction markings. The markings varied in terms of the incorporation and length of dotted and broken lines. In addition, half of the markings included a solid white line adjacent to the dotted/broken line. The supplemental solid white line resulted in improved understanding that the rightmost lane would end, earlier reported lane changes, and the highest preference ratings. Dotted lines also resulted in better understanding of an upcoming necessary lane change than did the longer, more traditional broken lane lines. Recommendations and suggestions for lane reduction marking changes to the Manual of Uniform Traffic Control Devices are made.