In today's BBC News:

A congestion-beating project that could lead to some of the UK's 9,000 miles (14,500km) of disused railway being paved with rubber, has been launched.

The flexible highways are made of panels of shredded car tyres laid over the existing tracks.

New thoroughfares could be shared by both cars and trams travelling at up to 50mph (80km/h) say Holdfast, the company behind the scheme.

But other users of disused railways do not support the plan.

"We would like to see these routes converted into walking and cycling routes," said Gill Harrison, a spokesperson for sustainable transport charity Sustrans.

The charity has converted approximately 1,000 miles (1,600km) of disused railways into part of the National Cycle Network.

"More road space does not automatically mean less congestion," she said.

"More roads just get filled up with more cars. We're not saying that cars do not have their place, but ultimately we've all got to think about other ways of getting around."

http://news.bbc.co.uk/2/hi/science/nature/5034912.stm

Now picture this option for the WMSR, Brush Tunnel, the EBT, etc........