the development of one-man-operation of buses, and the present "state of the art", are briefly reviewed in non-technical terms. one-man-operation is now well established in the uk, and is providing useful benefits to operators, though slow systems may not provide a net benefit for the community as a whole, due to longer journey times. for a typical pattern of passenger demand, present uk one-man buses have average stop-times ranging from 10 to 20 seconds, compared with times of as low as 7 seconds for two-man buses. there is some room for further development, but, in the foreseeable future, the average stop-times of uk one-man buses are unlikely to fall far below the present best results of about 10 seconds. the key to successful one-man-operation lies in minimising stop-time delays: in certain very busy situations two-man-operation may remain the optimum arrangement, but, in most circumstances, it is possible that the use of faster arrangements should enable one-man-operation to be beneficial to both the operator and the community as a whole. (a)

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