LONDON — London's mayor has asked the body overseeing transport in the capital to enforce the use of face masks on buses and trains as a “condition of carriage” after legal restrictions in England are lifted on July 19.

Sadiq Khan said Wednesday he is “not prepared” to put transport users in the capital “at risk” by removing the rules on face coverings after the legal obligation to wear them are lifted.

Conditions of carriage are contractual conditions between passengers and Transport for London, which oversees public transport in London. Under their terms, enforcement officers would be able to deny access or eject passengers not wearing masks while using the subway, buses and trams.

Earlier this week, British Prime Minister Boris Johnson confirmed that most of England’s coronavirus restrictions, including compulsory mask wearing in many indoor public settings, will end as part of the final stage of his road map out of the coronavirus lockdown. However, Johnson urged people to remain cautious and to exercise “personal responsibility.”