Transport policies On transport, Khan immediately announced the introduction of a "Hopper" bus ticket which would allow a passenger to take two bus and tram journeys within an hour for the price of one; it was intended to benefit those on low incomes most. In January 2018, this system was upgraded to offer unlimited journeys and allowing travel on Tube or rail services in between. In June 2016, Khan announced that his electoral pledge to prevent transport fare rises would only apply to "single fares" and pay as you go fares, and not daily, monthly, weekly, or yearly railcards; he was widely criticised for this. That same month, he ordered TfL to ban any advertising on its network that was deemed to body shame or demean women. In July he urged the government to allow TfL to take control of the failing Southern rail service, and in August launched the 24-hour Night Tube service on Fridays and Saturdays, an idea initially proposed by Johnson. Khan backed expansion of London City Airport, removing the block on this instituted by Johnson's administration; environmentalist campaigners like Siân Berry stated that this was a breach of Khan's pledge to be London's "greenest ever" mayor. Opposing expansion at Heathrow Airport, he urged Prime Minister Theresa May to instead support expansion at Gatwick Airport, stating that to do so would bring "substantial economic benefits" to London. In August 2020, Khan announced that Crossrail, a new east–west rail link through the centre of London, referred to as the Elizabeth Line, has been delayed again until 2022, requiring an additional £1.1 billion in funding to complete the project. The line was originally due to open in 2018 COVID-19 pandemic and government bailout During the COVID-19 pandemic in 2020, Khan was criticized for closing stations and reducing services on the tube network resulting in overcrowding and putting key workers travelling to work at risk. On 17 March 2020 Khan announced the London Underground would begin running a reduced service due to the virus. Khan shut down the Waterloo & City line, several tube stations and the Night Tube. From 20 March, 40 tube stations were closed. Khan was the first British political leader to call for face masks to be worn in public in April 2020. On 22 April, Khan warned that TfL could run out of money to pay staff by the end of April unless Boris Johnson's