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Impact of Regulatory Hybrid Changeable Message Sign on Traffic Safety under Different Freeway Geometric Designs

项目名称：	Impact of Regulatory Hybrid Changeable Message Sign on Traffic Safety under Different Freeway Geometric Designs
摘要：	The Utah Department of Transportation (UDOT) has implemented a Variable Speed Limit (VSL) zone on a section of I-80 using regulatory hybrid Changeable Message Signs (CMSs). In the current systems, the CMSs have been operated with white LED numbers on the black background. However, it has been found that the visibility of those numbers that indicate speed limits has become a problem during both winter and summer seasons. Hence, UDOT is now in the process of installing a new CMS system which replaces the color of white CMS LED by yellow. In the literature, although many recent studies have studied the impacts of CMS's visibility on improving safety, limited efforts have studied such impacts under different freeway geometric designs. By collecting historical crash locations in the VSL zones, the research team will further discuss how the new CMS can help to prevent crashes in various geometric design scenarios. By comparing the visibility of yellow-legend and white-legend CMS systems, the results will be discussed for the legend color selection for CMS. The collected safety data will be used to analyze the impacts of CMS on potential crash rate and severity using surrogate safety evaluation method.
状态：	Active
资金：	175000
资助组织：	Office of the Assistant Secretary for Research and Technology
项目负责人：	Tolliver, Denver
执行机构：	Dept. of Civil and Environmental Engineering
开始时间：	20200218
预计完成日期：	20220731
主题领域：	Data and Information Technology；Highways；Operations and Traffic Management；Safety and Human Factors