M4 J32 Coryton Interchange

Layout and signage

Caerdydd (G)
Cardiff (N)
Merthyr Tudful
Merthyr Tydfil
A470
  A4054


A470



   

A470

A4054
  Caerdydd (G)
Cardiff (N)
Merthyr Tudful
Merthyr Tydfil
A470

Lane configuration

LanesLanesLanesLanesLanes

  • Lane 1 exits and returns after the junction.
  • Lane 2 continues ahead.
  • Lane 3 continues ahead.

LanesLanesLanesLanesLanes

  • Lane 1 exits and returns after the junction.
  • Lane 2 continues ahead.
  • Lane 3 continues ahead.

In this section

What's new

The road that made no sense

It was the UK's only single-carriageway motorway, and twenty years ago it ceased to exist. This is the story of the strange fascination it held, and of my place in history.

The forever bottleneck, part 2

The second part of the story, where we learn why exactly the M4 gets narrower on the final approach to Europe’s biggest city.

The forever bottleneck, part 1

The M4 into London was one of the UK's earliest and most ambitious motorway projects. It was bold, pioneering... and almost instantly regretted.

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North Cross Route

The route and the history of the North Cross Route, proposed in the 1960s as the northern side of London's innermost motorway ring road.

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