London mayor Boris Johnson has spelled out contingency plans to deal with next week's Tube strike.
Transport bosses are laying on more than 100 extra buses, increasing capacity for over 10,000 more journeys on the river, organising marshalled taxi ranks and delaying or curtailing planned roadworks.
Volunteers will also be positioned at Tube, bus, and rail stations to help people with their journeys and provide maps and other information, and people who own a bike are being encouraged to cycle to work.
Thousands of members of the Rail Maritime and Transport union (RMT) and the Transport Salaried Staffs Association are due to strike for 24 hours from 7pm on Sunday, threatening travel chaos in the capital.
Hopes that talks between the two sides could be restarted were dashed on Thursday.
Transport for London said London Underground ran a third of its normal services during the walkout earlier this month, carrying over a million people.
Mr Johnson, said: "As we saw in the last strike, the belligerent actions of the union leaderships will not bring London to a halt. They may disrupt Londoners, but they will not stop us from getting around our city. We will keep London moving. We are expending every effort to give people alternative ways of getting around - boosting river and bus services, holding back road works and encouraging people to cycle.
"This strike is pointless and I hope that this time - when Londoners beat the strike once again - the RMT and TSSA leaderships will see sense and return to talks to avert further disruption."
Transport commissioner Peter Hendy said: "There is no need for this strike at all and we continue to make every effort to avoid a dispute. Despite the RMT and TSSA leaderships saying this is about safety, they have failed to raise a single safety-related point with London Underground in hour upon hour of talks, and have not responded to our request that they set out their specific safety concerns."
The unions have already held one strike in protest at plans to axe 800 jobs, and will stage two more walkouts in November if the deadlock is not broken.