A465 Llandarcy Interchange

Layout and signage

  M4










 		    M4










 		  Caerdydd — Cardiff
Port Talbot
Abertawe — Swansea
M4 Link
Sgiwen — Skewen
Llandarcy
Jersey Marine
B4290
Caerfryddin — Carmarthen
M4 Link

Lane configuration

LanesLanesLanesLanes

  • Lane 1 continues ahead.
  • Lane 2 continues ahead.

Other events

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

In this section

What's new

The sunlit uplands

On Saturday 31 May something historic happened. The Heads of the Valleys Road was finally complete.

Grand openings

Our much-loved Opening Booklets section has two new publications for you to explore, and we’re making some overdue changes to make them easier to find and easier to read.

Silver bullet

The Silvertown Tunnel is finally open for business. One question remains: what’s it for?

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Have you seen...

C-Roads

A collection of photos of signs confirming the existence of C-roads.

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