## New PDF release: Automation and Control in Transport

By F. T. Barwell

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7. (a) Car under automatic control, (b) Control apparatus in boot of car. Automatic Highway. 27 28 Automation and Control in Transport signal which is fed as a variable frequency pulse to a control cable laid into the road surface. This consists of two wires which are transposed laterally at fixed intervals so that the polarity of the magnetic pulses alternates as the car under control proceeds along the road. The frequency of this oscillation is naturally proportional to the speed of the vehicle and is compared with the imposed frequency representing the desired speed.

One system ensures correct sequence of operations by arranging for the "Line Clear", "Train on Line" and "Line Blocked" indications to be given by a rotary switch that is constrained to turn in one direction only by a ratchet and pawl. The normal indication is "Line Blocked". Rotation of the switch by one-third of a revolution gives "Line Clear" and by another third "Train on Line". It cannot be turned further until the train passes over a treadle, after which the original position can be restored.

22, p. 317 (1955). 10. EDIE, L. C. , Generation and propagation of start-stop traffic waves. Vehicular Traffic Science, Proc. 3rd Int. Symposium on the Theory of Traffic Flow, p. 26, New York, Elsevier, 1967. 11. HAUSLEN, R. , A computerised tunnel traffic control system. Proc. Ier Symposium Int. sur la Regulation du Trafic, Versailles, 1970. Preprint no. 1, p. 69. 12. , Automatic supervisory and control system at the Rheinallee Tunnel in Düsseldorf. Proc. Ier Symposium Int. sur la Regulation du Trafic, Versailles, 1970, p.