Mike Brown MVO, London's Transport Commissioner, said:
'The Government and the Mayor have given clear instructions to stay safe and to stop travelling in all cases other than critical workers making absolutely essential journeys.
'In line with this, TfL and Crossrail will be bringing all project sites to a temporary Safe Stop unless they need to continue for operational safety reasons. This means that work on all such projects will be temporarily suspended as soon as it is safe to do so. Essential maintenance of the transport network will of course continue.
'This is being done to ensure the safety of our construction and project teams and also to further reduce the number of people travelling on the public transport network. It is vital that the transport network is only used by critical workers. As we work through these issues with our supply chain, consideration will be given to the impact on workers, particularly those who are on low incomes.'