He urged people to continue to work from home if they could, but said if they did have to travel to work they should consider cycling or walking rather than taking to their cars, which would choke up the roads.
"Even with public transport reverting to a full service, once you take into account the 2-metre social distancing rule, there would only be effective capacity for one in 10 passengers in many parts of our network, just a 10th of the old capacity," he said.