Cross-winds increase in importance as more motorways are built; measurements made with an instrumented car in windy conditions on motorways are described. It is demonstrated that wind patterns and the occurrence of most gusts are dependent on the topography and features, such as bridges and cuttings, adjacent to the road. The relative importance of the various gust-causing features is enumerated and typical gusts, measured near these features, are shown. The value of artificial cross-winds is discussed, with particular reference to the realism of the M.I.R.A. facility.
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