# The Motorways Traffic (Speed Limit) Regulations 1974, Paragraph 2


That length of motorway which extends from its junction with the London-Bristol Trunk Road (A4) at Chiswick to the centre of the bridge carrying the Piccadilly Line of the London Transport Executive over the motorway, a distance of 2 miles 587 yards.

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Source: https://www.legislation.gov.uk/uksi/1974/502/schedule/2/paragraph/2 (the official version)
Page: https://openlegislation.uk/motorways-traffic-speed-limit-regulations-1974-uksi-1974-502/schedule-2/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.