# The Motorways Traffic (Speed Limit) Regulations 1974, Paragraph 1


That length of the eastern carriageway of the Blackwall Tunnel Southern Approach Road which extends from its junction with Dreadnought Street in a general southerly direction to a point 30 yards north of its junction with Westbrook Road, a distance of 3130 yards.

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Source: https://www.legislation.gov.uk/uksi/1974/502/schedule/1/paragraph/1 (the official version)
Page: https://openlegislation.uk/motorways-traffic-speed-limit-regulations-1974-uksi-1974-502/schedule-1/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.