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原文传递 EVALUATION OF TWO STRATEGIES FOR IMPROVING SAFETY IN HIGHWAY WORK ZONES.

题名：	EVALUATION OF TWO STRATEGIES FOR IMPROVING SAFETY IN HIGHWAY WORK ZONES.
作者：	Meyer-E
关键词：	85th-percentile-speed; Before-and-after-studies; Data-collection; Evaluation-; Improvements-; Interstate-highways; Kansas-; Lane-position; Raised-road-markings; Rural-areas; Speed-control; Speed-displays-Radar-triggered; Work-zone-safety; Work-zone-traffic-control
摘要：	During 1999, the Departments of Transportation from the states of Kansas, Nebraska, Iowa, and Missouri conducted a pooled-fund study of innovative devices designed to improve the safety and efficiency with which highway maintenance is conducted. In the state of Kansas, a total of nine devices were evaluated. This paper discusses the two devices that showed the greatest potential for improving the safety of highway work zones, a radar-triggered speed display and Lightguard lighted raised pavement markers (RPMs). The devices are described as they were evaluated, and the results are discussed with respect to the effectiveness of the devices relative to the current practice in Kansas. The speed display was also compared directly with active law enforcement at the same site. Speeds were used as a measure of effectiveness for both devices. Lane position was also used to evaluate the effectiveness of the Lightguard RPMs, which were used to delineate a crossover. In all cases, pneumatic hoses were used to collect the data. Data were collected for four days before and four days after the deployment of the speed display. Only one day of data was collected before and after activation of the RPMs. Both devices produced significant reductions in mean and 85th percentile speeds (statistically and practically significant). The RPMs resulted in a reduction in the percentage of passenger cars tracking within 30 cm (1 ft) of the edge line. The reduction was statistically significant at a 95% confidence level, though practical significance is difficult to assess in this case. Both devices were evaluated at rural interstate work zones. Further evaluation is needed to determine to what extent, if any, the effects of the devices decrease over time in a context with a high percentage of repeat traffic, such as an urban freeway.
总页数：	Conference Title: Mid-Continent Transportation Symposium 2000. Location: Ames, Iowa. Sponsored by: Iowa State University
报告类型：	科技报告