Route
Junction number
15
Markerpost
116.3 km
Name
Webbs Farm Interchange
Type
Terminus
Not a terminus
Other routes
A414, B1002
Authority
Restricted turns
Full access
Services
No services
A12 J15 Webbs Farm Interchange
Layout and signage
|
Harlow Chelmsford A414 |
A414 | 
|
B1002 |
Ingatestone Margaretting B1002 |
Lane configuration
- Lane 1 exits and does not return.
- Lane 2 continues ahead.
- Lane 3 continues ahead.
- Lane 1 is gained from the entry sliproad.
- Lane 2 continues, with option to exit.
- 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...
Daniel "Swampy" Hooper
Britain's most famous anti-road protester, who shot to fame in the mid-1990s and came to represent the whole environmental movement.
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