M4 Morriston and Llansamlet Bypass

Morriston and Llansamlet Bypass

Opened 24 August 1972

Chronology Map for 1972

Route

Start point

Lon-las

End point

Llangyfelach

Road scheme and chronology data is courtesy SABRE (where much of it was gathered by member Ross Spur), with additional data from the UK Motorway Archive, the Scottish Roads Archive and the Northern Ireland Roads Site.

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Chronology Maps
Location search
Key to exit lists

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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