A465 Hirwaun Interchange

Layout and signage

Hirwaun
Aberdâr — Aberdare
A4059
Treherbert
A4061
  A4059

A4059
    A4061   Hirwaun
Aberdâr — Aberdare
A4059
Treherbert
A4061

Lane configuration

LanesLanesLanesLanes

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

LanesLanesLanesLanes

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

In this section

What's new

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.

Hello, here's my ridiculous side project

An introduction to what I write, and why I write it, and where my strange new road sign simulator fits in to all this.

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British Roads FAQ

The most Frequently Asked Questions where British Roads are concerned, and the answers. A good place to start if you're new to the subject or you're looking for quick facts.

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