Passengers boarding London buses usually have to enter by the front doors and tap-in using a bank card or travel pass, forcing them to come within inches of drivers.

Khan hopes that the new measures, which will come into force on Monday, April 20, will make it easier for drivers and commuters to maintain a safe distance from one another and prevent the further deaths of drivers.

Announcing the decision, Khan said the deaths of 26 London transport workers from COVID-19 "breaks my heart."

"I will continue to do whatever it takes to keep our heroic transport workers as safe as possible," he said in a statement.

He added: "I would like to remind Londoners that you shouldn't be travelling by any mode of transport unless it is absolutely necessary, and public transport is only open for critical workers."

Under current rules, extended by another three weeks on Thursday, British people are barred from using public transport unless they are making an essential journey.

The public are also advised to remain two metres away from one another when outside their homes.

Public transport use has declined by around 90% in London since the national coronavirus lockdown was implemented.