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A high-speed road monitor (HRM) has been developed for measuring road surface characteristics and road alignment. It simultaneously measures longitudinal profile, rutting, macrotexture, and road alignment while traveling in the normal traffic stream. Correlation coefficients exceeding 0.9 have been obtained between manual surveys of profile, rut, texture, and road alignment, and the corresponding HRM measurements. The relationship between surface data and road condition has been investigated, and change profile unevenness with time has been found to be a useful indicator of road deterioration. Other investigations particularly into ride have provided criteria for assessing the serviceability level of a road.
For routine use, a computer-analysis program has been developed to analyze the large volumes of data collected by the HRM. The paper describes the main elements of the program and concludes that the combination of equipment and analysis system provides a cost-effective surveying and assessment system for a primary road network.
equipment, profile, rut, texture, road alignment, road condition surveys
Head, Transport and Road Research Laboratory, Crowthorne, Berkshire