Boris Johnson has unveiled plans for a 29km cycle route across the capital.
The mayor of London said the east-to-west route would allow cyclists to travel from Barking to Acton almost completely segregated from traffic.
A separate north-to-south option will take cyclists the 5km from King’s Cross to Elephant & Castle.
The urban cycleways form the centrepiece of the mayor’s £913M commitment to get more Londoners on their bikes.
On the Westway flyover, one lane will be removed to create a segregated cycle track for the east-to-west route.
Protected cycle routes will also be created through dangerous junctions including Tower Hill, Blackfriars, Parliament Square and Lancaster Gate.
Connections will be created to cycle routes servicing other parts of the City, West End and London’s suburbs.
A detailed public consultation has been launched, with work due to start on site early next year and the routes planned to be open in March 2016.
Johnson said: “Bikes already make up 24 per cent of all rush-hour traffic in central London – hundreds of thousands of journeys every day that would otherwise be made by car or public transport.
“Getting more people on to their bikes will reduce pressure on the road, bus and rail networks, cut pollution, and improve life for everyone, whether or not they cycle themselves.”