Route
Junction number
15
Markerpost
95.0 km
Name
Thorney Interchange
Type
Terminus
Not a terminus
Other routes
M4
Authority
Restricted turns
Full access
Services
No services
M25 J15 Thorney Interchange
Layout and signage
(T1, 2 & 3)
Lane configuration
- Lane 1 is gained from the entry sliproad.
- Lane 2 is gained from the entry sliproad.
- Lane 3 exits and returns after the junction.
- Lane 4 continues ahead.
- Lane 5 continues ahead.
- Lane 6 continues ahead.
- Lane 1 exits and does not return.
- Lane 2 exits and does not return.
- Lane 3 exits and returns after the junction.
- Lane 4 continues ahead.
- Lane 5 continues ahead.
- Lane 6 continues ahead.
Other events
Variable Speed Limits apply
- Variable Speed Limits apply
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...
Aust to Beachley
Today two motorways cross the Severn near Chepstow. But as recently as 1965, the only crossing was a ferry that carried six cars at a time, from Aust to Beachley.
About this page
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