A4

M4 and A4

Serving Reading, Bristol and South Wales, the A4 and M4 are one of London's most important approaches. But the wildest fantasies of the sixties couldn't overcome its trickier problems.

Routes
M4 A4

What's new

Go west! New Ringways pages are here

A new set of Ringways pages are now online, looking at unbuilt motorways and road projects west of London.

No smoke without ire

London's Ultra Low Emission Zone has just expanded to cover the whole inner city, and across the UK, other cities are implementing their own Clean Air Zones. Is this the future?

Devon help us

Road signs are colour coded for different types of road, but in Devon there are more colours than anywhere else. What do Devon's colourful signs mean?

Have you seen...

The Improbable A39

It crosses cattle grids and untamed moorland, it climbs 1-in-4 hills and plummets through hairpin bends, it runs single-track through woodland and historic villages. It's rugged and beautiful. Is it really the A39?