Route
Junction number
12
Markerpost
107.8 km
Name
Marylands Interchange
Terminus
Not a terminus
Other routes
A1023, B1002
Authority
Restricted turns
Full access
Services
No services
A12 J12 Marylands Interchange
Layout and signage
|
Billericay A1023 (A129) Mountnessing Ingatestone B1002 |
B1002 | 
|
A1023 (A128) (A129) |
Brentwood A1023 Kelvedon Hatch (A128) |
Lane configuration
- Lane 1 continues, with option to exit.
- Lane 2 continues ahead.
- Lane 1 exits and does not return.
- Lane 2 continues ahead.
- Lane 3 continues ahead.
What's new
The road that made no sense
It was the UK's only single-carriageway motorway, and twenty years ago it ceased to exist. This is the story of the strange fascination it held, and of my place in history.
The forever bottleneck, part 2
The second part of the story, where we learn why exactly the M4 gets narrower on the final approach to Europe’s biggest city.
The forever bottleneck, part 1
The M4 into London was one of the UK's earliest and most ambitious motorway projects. It was bold, pioneering... and almost instantly regretted.
Have you seen...
A Piece of History
The lowly and pathetic A6144(M) motorway was downgraded in May 2006. This is the story of the mission to rescue some memorabilia.
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