a study has been made of the entry capacities of offside priority roundabouts at twenty-eight public road sites. the results have been used to check and calibrate provisional formulae developed previously by means of a full-scale track experiment at trrl. the effects of traffic composition have been assessed and passenger car units derived for heavy vehicles and two-wheelers in the entry and circulating flows. slightly simplified versions of the track experiment equations have been developed for public road conditions; they allow the capacity of an individual entry to be predicted given the circulating flow across the entry and certain geometric parameters, notably the entry width and flare.(a)

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