The go - ahead has been given to build a double deck tunnel under the River Thames.
Motor cars will be able to exchange tunnels, going up a special ramp which link's the two tunnels.
This was announced by the London City Metropolitan Council.
The two tier tunnel, linking Southwark with Northwark on the opposite side, will relieve traffic congestion.
Northwark is a busy town in between the City and Westminster and comes under London City Metropolitan Council.
The tunnel will be in between London Bridge and Tower Bridge.
Once the Tower Tunnel is built Tower Bridge will be removed and built, mounted on top of London Bridge, making it the first multi - Storey Bridge in London that is two bridges in one.