A £30 billion plan to transform London’s roads over the next 20 years, with more 20mph zones, cycling improvements and new ‘flyunders’, has been unveiled by Mayor of London Boris Johnson.

The proposal includes improvements to the North and South Circular roads and introducing major schemes at Vauxhall, Waterloo, Elephant & Castle and Old Street.

The Mayor of London’s Road Task Force is working on the blueprint, which imagines more people travelling during off-peak hours to cut rush hour congestion, with 1.7 million extra people predicted to live in the capital by 2031, resulting in 25 per cent more journeys per day.

A total of 19 road schemes are also outlined in the transport vision, supporting more than 300,000 jobs.

Streets could also be made greener, with 1,000 more trees planted along roads using more low-energy street lighting.

And the North and South Circular roads could be rerouted through tunnels and roofed over where they have bisected communities.

Jo Valentine, chief executive of business organisation London First, said: “London’s roads are vital to businesses, which need reliable access to customers, supplies and staff.

“Bold ideas such as ‘flyunders’ and smarter road charging are common in other global cities and we encourage Transport for London to examine how they might now work in London.

"More immediately, London needs a prioritised list of shovel-ready schemes with a timetable for implementation.”