A11 Thickthorn Interchange

Layout and signage

Hethersett B1172
Services Thickthorn
Swaffham A47
Great Yarmouth A47
Ipswich (A140)
Lowestoft (A146)
  A47

B1172
    A47
(A140)
(A146)

  Great Yarmouth A47
Ipswich (A140)
Lowestoft (A146)
Hethersett B1172
Services Thickthorn
Swaffham A47

Lane configuration

LanesLanesLanesLanes

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

LanesLanesLanesLanes

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

Other events

  • Signs Traffic signals
  • Signs 40mph speed limit begins
  • Signs Traffic signals
  • Signs National Speed Limit begins

In this section

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What might it have been like to stand in one spot and witness the arrival, and the uncertainty, of plans for an urban motorway in West London?

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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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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