the wind-averaged drag coefficient provides a means of assessing the aerodynamic performance of a road vehicle in relation to the wind conditions encountered in-service. this report provides justification for its use, together with details of a study of the various approximations which can be made in its evaluation. the choice of a suitable height at which to define the wind speed is discussed, as are techniques for correcting observed wind speeds to this standard height. appendix 1 contains a description of a computer program for evaluating wind-averaged drag coefficients which is at present in use at trrl.(a)

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