Route
Junction number
None
Markerpost
28.5 km
Name
Black Cat Roundabout
Type
Roundabout
Terminus
Terminus at top of exit list
Other routes
A1
Authority
Restricted turns
Full access
Services
No services
A421 Black Cat Roundabout
60mph speed limit begins
National Speed Limit beginsWhat'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?
Have you seen...
Forth Bridges
There's plenty of pictures of the three magnificent bridges over the Firth of Forth at Queensferry. But not many are taken from beneath.
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