this report described an investigation to determine the excess fuel costs and the costs of delay times which arise at roundabouts. measurements were made using three representative passenger cars. from the results obtained, the extra fuel costs, based on 1972 prices, are shown to be small compared with the delay time costs, whereas costs based on 1974 fuel prices are comparable with the time costs. all three vehicles had a similar variation of total cost due to the roundabout with their speed of approach. the idling, steady speed and accelerating fuel consumptions have also been measured, and the relevance of these results to cost-benefit analysis of road schemes is outlined. (a)

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