this report gives an analysis of the sensitivity to traffic estimates of rural road planning decisions in developing countries. consideration was given to decisions concerning the annual amounts spent on maintaining each section of road, the economic justification of road improvements, and the selection of road design standards and hence construction costs. the report shows how each of these decisions is sensitive to the traffic parameters used in making them. many of the traffic parameters are shown to be subject to large errors due to the estimating methods currently in use. this is particularly the case with estimates of induced traffic likely to result from road improvements and the forecasts made of all future traffic for planning and designing road improvements. the analysis stresses the need for improvements in traffic estimation methods and for further research into the fundamental characteristics of rural road traffic in developing countries. (a)

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