Effective today, it is now compulsory to wear face coverings on public transport in England.
The new rules require anyone travelling by bus, coach, train, tram, tube, ferry or plane to cover their face while on board. They exclude school transport, taxis and private hire vehicles, although Uber has made face coverings compulsory for passengers and drivers.
People with certain health conditions, disabled people and children under the age of 11 will be exempt from the rule.
Passengers without a face covering will be asked to wear one, or will face being refused on board or fined £100.
Masks can be homemade, such as a scarf or a bandana.
The compulsory rules do not apply in Scotland, Wales or Northern Ireland, but their governments recommend that people cover their faces in places where social distancing is difficult.