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Traffic Signs Manual (PDF). Department for Transport. 2019. p. 10. ISBN 978-0-11-553223-8. Smith, Michael J.; Koubek, Richard John, eds. (2001). Usability Evaluation...

Signs". Traffic Signs Manual (PDF). London: TSO. 2019. p. 18. ISBN 978-0-11-553223-8. Retrieved 27 April 2020. UK Department of Transport. Traffic Signs...

(PDF). London: The Stationery Office. 2019. p. 36, section 4.7.4. ISBN 9780115532238. Retrieved 8 May 2020. "The Traffic Signs Regulations and General Directions...