SYMPOSIA PAPER Published: 01 January 1985

Relationships Between Vehicle Speed, Ride Quality, and Road Roughness


The relationship of vehicle response to road roughness and speed is quantified from two major data sets obtained from response-type roughness measuring systems used in Brazil. The average rectified slope and average rectified velocity (ARV) response statistics are expressed in terms of speed and a reference roughness scale in a generalized relationship applicable to most road surfaces. Corrugated surfaces require explicit analysis. The effect of road roughness on average traffic speed, that is, the driver's response, is quantified as a function of the vehicle's ARV response and vehicle type; the limiting values estimated for six vehicle classes range from 150 to 280 mm/s. The issues of roughness measurement speed, a reference speed for a universal roughness scale, and the relationship between road roughness and vehicle operating costs are discussed.

Author Information

Paterson, WDO
The World Bank, Washington, DC
Watanatada, T
The World Bank, Washington, DC
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Developed by Committee: E17
Pages: 89–110
DOI: 10.1520/STP34596S
ISBN-EB: 978-0-8031-4948-9
ISBN-13: 978-0-8031-0428-0