A3 Hog's Back Junction

Layout and signage

  A31     A31   Farnham
Aldershot (A331)
A31

Lane configuration

LanesLanesLanesLanes

  • Lane 1 continues, with option to exit.
  • Lane 2 continues ahead.

Other events

  • Signs 50mph speed limit begins
  • Signs National Speed Limit begins

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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M4 Chiswick-Langley

An early triumph of the motorway programme, the M4 between Chiswick and Langley linked Central London to Heathrow - then still known as London Airport - and was the start of a new motorway west.

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