Are We There Yet? Guide to the M4

The 189 mile M4 motorway runs between London and Carmarthernshire, in Southwest Wales. It was commenced in 1961 and completed in various stages, eventually finished in 1996 after being rerouted. Slough, Reading, Swindon, Bristol, Newport, Cardiff, Bridgend, Port Talbot and Swansea are major towns and cities along its route.

But what can YOU see from the window?