This paper is also published in: Transport Policy : proceedings of Seminar F held at the PTRC European Transport, Highways and Planning 19th summer annual meeting, University of Sussex, September 9-13 1991. Volume P346 1991, p. 91-94.
In: Traffic management and road safety : proceedings of seminar K (P350) held at the 19th PTRC European Transport, Highways and Planning Summer Annual Meeting, University of Sussex, September 9-13, 1991, p. 97-100
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