Abstract
Traffic noise needs to be described in physical terms such that measurements or predictions of noise exposure in these units are effectively measurements or predictions of nuisance. Such units are developed by the means of social surveys, and typical survey techniques are briefly described. Of the three current proposals: Wilson Proposals, Traffic Noise Index and Mean Energy Level; the Wilson Proposals fail the requirements of a physical unit intended to be the basis of traffic noise control because of the lack of demonstrated correlation of noise levels with nuisance. Both Traffic Noise Index and Mean Energy Level have been shown to correlate well with nuisance but nevertheless the formulations of these two units are, in some respects, conflicting. The development and the relative merits of the two units are discussed, and the direction of further research into traffic noise is outlined.
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