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Abstract
The planar development method of representing seat-belt fit was proposed in an earlier paper, which applied it to a geometrical representation of the shoulder area. The present paper extends this method by giving a geometrical representation of the lap area, and by extending the geodesic principle to cope with complex belt installations in which the webbing does not run simply from anchorage to anchorage. With the earlier paper, the present work enables problems of seat bell fit to be studied by a computer model. The paper also discusses the modelling of a multi-dimensional population, with consequent improvement over the use of the percentile concept, widely used in anthropometry, to describe such a population.