A406 Henly's Corner (east)

Layout and signage

Central London
Holloway
A1
  A1       Central London
Holloway
A1

Lane configuration

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  • Lane 1 is gained from the entry sliproad.
  • Lane 2 continues, with option to exit.
  • Lane 3 continues ahead.
  • Lane 4 continues ahead.

LanesLanesLanesLanesLanesLanes

  • Lane 1 continues ahead.
  • Lane 2 splits to create a new lane.
  • Lane 3 exits and does not return.
  • Lane 4 exits and does not return.

Other events

  • Signs Traffic signals
  • Signs 40mph speed limit begins
  • Signs Traffic signals
  • Signs 50mph speed limit begins

In this section

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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.

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