详情

原文传递 Ride Quality Thresholds from the Motorist's Perspective.

题名：	Ride Quality Thresholds from the Motorist's Perspective.
作者：	GARVEY, P. M.; GHEBRIAL, R. C.; PIETRUCHA, M. T.; POISTER, T. H.; SMITH, C. L.
关键词：	PAVEMENTS; QUALITY; ROAD SURFACES; SURFACE ROUGHNESS
摘要：	The Pennsylvania Department of Transportation (PENNDOT) has made a strong commitment to improving ride quality on Pennsylvania highways, as measured by the International Roughness Index (IRI). Higher IRI values represent rougher roads, while lower IRI values mean smoother roads. Over the past several years substantial progress has been made in reducing IRI values, thereby improving ride quality on Pennsylvania highways. However, while IRI values serve well for monitoring trends over time, they do not provide a direct indication of the extent to which the roads afford at satisfactory ride quality. Prior research has shown very strong correlations between individual motorists' ratings of ride quality on specific roads and IRI on these same roads, but there is much less research on IRI 'break points' or ranges where ride quality shifts from being acceptable to unsatisfactory from the motorist's point of view. The present research project obtained these break points by driving 500 Pennsylvania motorists, over more than a thousand miles of roadways in six Pennsylvania counties and asking those motorists to rate the ride quality of specified roadway segments. This study identified the threshold values or ranges on the IRI scale that represent acceptable ride quality to the traveling public along with a number of other features of highway quality, including physical condition of the surface, lane width, shoulder width, shoulder condition, sight distance, signage, width of bridges, east of entrance and exit and overall condition. The results of the present work provided PENNDOT with customer feedback on an array of highway features and provided IRI value that can confidently be used to meet customer expectations.
报告类型：	科技报告