Route
Junction number
9
Markerpost
35.5 km
Name
Treborth Interchange
Type
Non-standard interchange
Terminus
Not a terminus
Other routes
A487
Authority
Restricted turns
Full access
Services
No services
A55 J9 Treborth Interchange
Layout and signage
|
Bangor Caernarfon A487 |
A487 | 
|
A487 |
Bangor Caernarfon A487 |
Lane configuration
- Lane 1 continues, with option to exit.
- Lane 2 terminates.
- Lane 1 has option to exit and splits to create a new lane.
Other events
50mph speed limit begins
National Speed Limit begins
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?
Have you seen...
Preston Bypass
The very first motorway was eight miles of relief for the Lancashire town of Preston. It goes without saying that there's an interesting story to be told about it.
About this page
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