this report analyses the results of an inter-urban route choice study in gloucestershire to estimate the potential benefits available to a perfect system of route guidance operating throughout great britain. the contribution from commuter, leisure, business and commercial vehicle journeys are considered separately. it is estimated that about 540 million was effectively wasted in great britain in 1979 by drivers who sought but failed to find minimum time or distance routes on unfamiliar journeys greater than 5 km in length. it is thought that this wastage represents the potential benefits available to a perfect system of route guidance. the consequent saving in vehicle-kilometres might also produce a saving in road accidents, bringing the total benefit to around 575 million per year.(a)

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