Samenvatting
Details are given of an automatic electronic fog warning sign, which, by way of experiment, is placed along the Cologne-Aachen motorway.
Details are given of an automatic electronic fog warning sign, which, by way of experiment, is placed along the Cologne-Aachen motorway.
Auto Motor Sport, 1971, Heft 6 (13 März), p. 51 + p. 53
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