Abstract
Publisher Summary Automatic guided vehicles running on existing roads and motorways have been proposed as part of future land transportation systems. A buried guidance wire should be cheaper than railway track and in theory, any existing steerable vehicle can be adapted to run under automatic control. Fundamental to the practical implementation of a guided vehicle scheme is the provision of a high reliability steering servo-mechanism. The technical problems of drive-by wire are similar in some ways to those of fly-by-wire; both must have high integrity but the vehicle system must be produced at automotive rather than aerospace costs. Standby redundancy was rejected for a number of reasons, including the difficulty of ensuring a smooth switchover to the standby channel and the all important fact that there is no way of ensuring that an idle standby channel will be in working order when called upon. Active redundancy on the other hand has a number of advantages. Both channels of a duplex system are working all the time so that they can be monitored for correct performance at any time.
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