experiments in glasgow and west london have shown that substantial savings in journey time can be obtained by co-ordinating signals on an area basis,using optimised fixed-time plans produced by either the combination method or transyt.the production of these plans involves preparing a fair amount of data and making a number of traffic engineering decisions.although important,the work is straightforward and the need for very accurate data and decisions is often less critical than might be expected. this paper describes the steps involved in using the combination method and transyt,including specification of the network,collection and checking of traffic data,calculation of cycle times,the use of computer programs and implementation on the street.(a) this report was first presented as a paper at a colloquium on area traffic control organized by the institution of electrical engineers at savoy place,london w c 2,in may 1972.

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