Cycle lanes in the sky
How would you fancy riding your bike across a cycle lane high above the rooftops?
The futuristic designs were made a group of architects who think the lanes would help people get to work and cycle safely - away from cars.
The cycle lanes could run alongside train tracks to help cyclists zip around the city.
The mayor of London, Boris Johnson, says he thinks the idea is "exciting" and his team are looking into it.
But there'll be a lot of work to do before a project like this can become reality.
Video courtest of Room60 and Exterior Architecture.