A470

A470

Merthyr Tydfil to Cardiff

Think of the busiest roads in Wales and you will inevitably think of the M4 and the A55. Often overlooked is the A470 between Cardiff and Merthyr Tydfil, a remarkable road that is, by any meaningful measure, an urban motorway.

Routes

A470 End to End

The road that connects Wales together, but which nobody really uses... All five hours of the A470, from Llandudno to Cardiff, are here.

Routes

What's new

Imperfectly Odd: Batheaston Bypass

It has viaducts, a tunnel and plenty of controversy, but the amazing Batheaston Bypass doesn’t really work. What went wrong?

South London's lost motorways

Completing the story of London's epic Ringways, we've just published the Southern Radials, five more motorways that never saw the light of day.

To the north east!

Two new additions to our collection of Opening Booklets take us to Darlington and Middlesbrough.

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Harry Yeadon

A civil engineer, working principally in the North West of England, responsible for many of the area's motorways.