Abstract
The presentation of a paper to engineering societies of two countries, on a subject of such breadth, involves some difficulties of arrangement. It has been thought best to treat the subject in two parts, with the intention that the first shall deal with the influences which encourage or restrict the engineer in his quest for improvement, and thus serve as a background against which the development of the road vehicle, described in the second part, may be better understood. It may seem incongruous to devote so large a proportion of the paper to the social and economic side of the subject, but in truth no such apology is needed. The engineer must be fully appreciative of these aspects if he is to succeed in the quest for improvements in performance and economy. In the second part it has been impossible to deal with the detail design and performance of every part and type. The more fundamental problems and newer developments have, therefore, been selected for review.
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