Route
Junction number
9
Markerpost
Unknown
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
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?
Skid Risk, Accident, Fog
For the first time, we can share pictures of the pioneering experiment that lit up the Worcestershire countryside with enormous signs 61 years ago.
Have you seen...
Reigate Tunnel
An unassuming Surrey market town with an amazing claim to fame — the world's first road tunnel.
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