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What do the numbers mean on the third line of the signs?

April 26, 2017line mean Numbers signs

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What do the numbers mean on the third line of the signs?

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The numbers indicate the distance from a defined point on the network, measured in kilometres. For example, on the M25, the distance is measured clockwise round the M25 from the Dartford crossing. This enables the emergency services to determine the location of an incident to within 500 metres.