Nearly 70% of the world's population will live in cities.

Many of the mega cities with populations of more than 10 million moving people around each megalopolis will be a huge challenge.

The average traffic speed in central London has fallen to about seven miles per hour around the same speed it was 150 years ago in the days of the horse and cart.

But city planners are working on solutions to the gridlock.

Self driving cars will play a part.

It's predicted they'll already be More than 30 million autonomous cars on the road by 24 PSI.

Autonomous vehicles are already in operation in controlled areas, for example, as airport shuttle's by 2050 city streets are likely to be patrolled by robo taxis.

That weaken summoned it.

A single touch public transport will be highly personalized.

No more scouring the bus timetable.

Instead, Internet connected transport shuttles will dynamically root themselves according to where the passengers need to go.

That slow last mile of travel may shift to two wheels.

Electric scooters and bikes schemes will proliferate.

We're still illegal in many places amid safety concerns, but cities could build special lanes to accommodate riders.

German and southeast China already has an eight kilometer elevated cycle way, and academics worldwide are designing much longer covered tubes to protect Ryder's high above city streets.

That's another likely feature of urban transport.

In 2050 it will be multi level.

Companies like Uber and Liliom Jet are planning fleets of flying taxis, electric jets that can take off vertically from landing pads dotted around the city.

Underground systems may include the Hyperloop, with travel pods hurtling down vacuum sealed tubes at high speed.

All that might mean more space at ground level.

Many cities are already turning some central streets into pedestrian zones.

Urban transport in 2050 might, for many people return to the oldest form of all.