Route
Junction number
9
Markerpost
43 km
Name
Dunton Interchange
Terminus
Not a terminus
Other routes
A446, A4097
Authority
Restricted turns
Full access
Services
No services
M42 J9 Dunton Interchange
Layout and signage
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.
Other events
National Speed Limit begins
Variable Speed Limits apply
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...
Studland Motor Road
The first motorway opened in 1958. The first road restricted to motor traffic, on the other hand, opened in 1923...
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