By F. T. Barwell
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Extra info for Automation and Control in Transport
The next stage is to provide for automatic control of vehicle spacing. Firstly it is necessary to detect the presence of an obstruction. This can be achieved by dividing the road into blocks about 20 feet (6 metres) long. Within these blocks three coils are laid into the surface of the road, each extending to the full width of the traffic lane. Two coils, each embracing half the block length, are connected in opposition and fed with current at a frequency of from 15 to 30 kHz. The third coil embraces these two coils so that it normally experiences a balanced induction and therefore zero excitation.
Paris, 1965. 5. MICHAELS, R. M. and COZAN, L. C. 6. ANON, Modern Transport, vol. 87, no. 2257, p. 12 (1962). 1. Necessity for signalling on railways As indicated in Fig. 6, the visual observation of the route ahead can provide sufficient information for the preservation of a safe vehicle spacing under present-day road conditions. This is not the case when railways are operated in the traditional manner particularly when freight is carried in wagons whereon the brakes are not under the control of the driver.
Vol. 10. 5. TANNER, J. C , The delay in pedestrians crossing a road. Biometrika, vol. 38, p. 383 (1953). 6. GARWOOD, L. The application of the theory of probability to the operation of vehicle-controlled traffic signals. / . Roy. Stat. Soc, suppl. 7, p. 65 (1960). 7. WARDROP, J. , Some theoretical aspects of road traffic research, Proc. Instn. , part II, vol. l , n o . 2, p. 325(1952). 8. , HERMAN, R. , Further developments of the Boltzmann-like theory of traffic flow. Proc. 2nd Int. Symposium on the Theory of Road Traffic Flow, Paris, Office of Economic Cooperation and Development, p.
Automation and Control in Transport by F. T. Barwell