Plans to make London's entire transport network zero-emissions by 2050 have been unveiled by Sadiq Khan.

The London mayor published a number of measures aimed at tackling congestion, overcrowding and pollution.

His draft transport strategy includes extending the London Underground, Docklands Light Railway and London Overground.

It also includes plans for new green buses and taxis and transforming streets to make walking, cycling and public transport the most attractive and practical choices.

Mr Khan has also suggest the possibility of charging motorists based on the distances they drive in the city.

The per-mile charge would vary based on the time of day, congestion and how polluting the vehicle is.

This could replace schemes such as the Congestion Charge and low emissions zones.

Mr Khan said: "It has been an incredibly difficult few weeks for London, but we must carry on as a city and that means pushing forward our work to keep Londoners moving around our city.

"London is the greatest city in the world and as it continues to grow it is vital that we take a bold approach to ensure our transport network works for all. We simply cannot afford to take the same old approach to travel as our growing population puts increasing pressure on our network.

"Only by focusing on active travel, providing efficient zero-emission transport and reducing our dependency on cars, can we improve the health of Londoners, support economic growth, deliver homes and jobs, and make our city an even better place to live."

RAC roads policy spokesman Nick Lyes said the mayor was "particularly brave" to raise the idea of road pricing for motorists.

He said: "This was mooted some years ago on a national scale and quickly dropped as it was seen as a way to charge drivers on top of what they already pay in motoring-related taxation, something the mayor would need to try to avoid if it is to work in the capital."

"It would require the fitting of black box technology into every vehicle, which may work for residents living and using roads in Greater London, but which might be more problematic for occasional visitors driving into London from outside the capital."

Cycling UK policy director Roger Geffen praised Mr Khan's vision for London's future transport strategy.

He said: "The Mayor of London's ambitious targets to reduce the volume of motor traffic on London's roads, making it a safer, cleaner and pleasanter city is a breath of fresh air from our otherwise polluted capital."