Lisbon has taken several steps to ensure that public transport can continue to run for those who need it and is safe and hygienic. All vehicles in service will be frequently disinfected, with special attention given to key areas. Several measures are aimed at ensuring minimal contact with drivers, including physical separation from the driver with a barrier; boarding and alighting through the back door with the front door remaining closed; and the suspension of on-board sales. Additionally, ticket validation will be optional, and there will be mandatory service to all stops, so that passengers do not have to press the 'stop' button.