The impossibility of completely isolating the effect of safety improvements to urban road systems from other effects of modifying the system is discussed. Particular reference is made to the lower accident rates on motorways which may be offset by the increase in generated traffic.
In: Are urban freeways really necessary? : a symposium organised by the Transportation Branch of Sydney division of the Institution and the Australian Section of the Institute of Traffic Engineers, The Journal of the Institution of Engineers, December 1973, p. 13-16 + p. 22, 3 tab., 5 ref.
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