Abstract
DURING the last few years there has been a rapidly increasing demand for electric traffic signalling apparatus. With fixed time signalling, unnecessary delays are often caused, and this often leads to a disregard of the signals. For this reason the tendency is now to use purely automatic apparatus, operated by the traffic itself. In South Africa a recent enactment withdrew the nationalist police from traffic duties. This has led to a traffic-operated scheme being put on trial at a street crossing in Johannesburg for several months. This has proved such a success that it has been decided to place an order for twenty-six more of the same type. There is now a large world market for street traffic devices, but Britain is experiencing considerable competition from Central Europe and Japan. The low cost of labour in the latter country has considerably reduced the price of electric lamps. It is difficult to compare the relative values of electric lamps, as a life test is a difficult and expensive operation.
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Street Traffic Devices. Nature 132, 235 (1933). https://doi.org/10.1038/132235d0
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DOI: https://doi.org/10.1038/132235d0