The geometric standards of a road, such as width, minimum curve radius, and maximum grades, can have a major effect on the costs of road construction and maintenance and on the speed, safety, and vehicle operating costs experienced by those who travel on the road. The report investigates methods for evaluating traffic capacity and improvements to road geometry in order to determine economically justified levels of investment in road geometry. A number of models are available for predicting speeds and operating costs for isolated vehicles as a function of road geometry. Of these the World Bank's Highway Design and Maintenance Standards Model (HDM-III) was found to have some advantages. The report concentrates on the development of simple models for incorporating the effects of increasing traffic flow into the road evaluation process. (Copyright (c) 1987 The International Bank for Reconstruction and Development/The World Bank.)
Evaluating Traffic Capacity and Improvements to Road Geometry
1987
157 pages
Report
Keine Angabe
Englisch
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