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Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient consent Not required.
Provenance and peer review Not commissioned; internally peer reviewed.
Author note Open letter addressed to four transport ministers in the UK: Humza Yousaf, Minister for Transport and the Islands, Scotland; Karen Bradley, MP, Secretary of State for Northern Ireland; Ken Skates, MP, Cabinet Secretary for Economy and Transport, Wales; Chris Grayling, MP, Secretary of State for Transport, England.
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