Safety Improvement from Edge Lines on Rural Two-Lane Highways. Tech Summary, State Project No. 200004880.

摘要

The previous study Impact of Edge Lines on Safety of Rural Two-Lane Highways completed in 2005 concluded that, with edge lines, centralization of a vehicles position is more apparent during nighttime, which reduces the risk of runoff -road (ROR) accidents and head-on collisions, and edge line markings generally cause drivers to operate their vehicles away from the road edge, irrespective of the roadway alignment. Does the changed vehicle lateral position reduce the frequency of crashes. Answering this question is important to the Louisiana Department of Transportation and Development (LADOTD) since implementing and maintaining edge lines on narrow two-lane highways require signifi cant resources from LADOTD. There are more than 40 percent of rural two-lane highways in Louisiana with a pavement width (excluding shoulders) of less than 22 ft. with no edge lines. The goal of this project was to investigate the safety impact of edge lines on rural, two-lane highways in Louisiana. Specifically, the research objectives were to: Identify the segments that will benefit from implementing the pavement edge line the most; Implement pavement edge lines at selected locations; and Conduct a before-and-after study at these locations to estimate the crash modification factors (CMF)