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


That length of the western carriageway of the Blackwall Tunnel Southern Approach Road which extends from a point 10 yards south of its junction with Westbrook Road in a general northerly direction to its junction with the slip road from Blackwall Lane, a distance of 2950 yards.

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Source: https://www.legislation.gov.uk/uksi/1974/502/schedule/1/paragraph/2 (the official version)
Page: https://openlegislation.uk/motorways-traffic-speed-limit-regulations-1974-uksi-1974-502/schedule-1/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.