The report includes a description of the testing and evaluation methodology of the 'E-ZPass(SM) Purple Light Experiment.' Purple lights with advanced signs were installed as supplemental traffic control devices for northbound and southbound E-Zpass(SM) movements along the I-93 approaches to the Hooksett Toll Plaza. The purpose of the purple lights was to improve toll plaza operations and safety through the reduction in the number of conflicts created by last minute lane changes at the tool booths and weaving maneuvers that take place between the approach lanes and the toll booths. The Hooksett test site was selected because of the unique characteristics of the horizontal and vertical geometrics that connect to the toll plaza from te north and south. In addition, this site is prone to early morning fog, a condition that may be susceptible to improved traffic operations given these wayfinding lights.


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