condition of carriage

condition of carriage (plural conditions of carriage)

1. A requirement that must be adhered to when travelling on public transport.
   • 2021 July 28, Paul Clifton, “Network News: Confusion and dissent over face mask requirements: Reaction to the Guidance across the regions: London”, in RAIL, number 936, pages 8–9:

     Mayor Sadiq Khan [...] said masks on trains and buses would remain mandatory. "We are making it a condition of carriage," he told the BBC. "If you want to use our services, a condition of using them is that you wear a face mask. If you're not exempt, you can be refused entry.

• Transport for London