Route
Junction number
None
Markerpost
11.4 km
Name
Marsh Leys Interchange
Terminus
Not a terminus
Other routes
A428, B531
Authority
Restricted turns
Full access
Services
No services
A421 Marsh Leys Interchange
Layout and signage
|
Northampton A428 (A6) Bromham Kempston |
B531 A428 (A6) |
|
Northampton A428 (A6) Bromham Kempston |
Lane configuration
- Lane 1 is gained from the entry sliproad.
- Lane 2 continues, with option to exit.
- Lane 3 continues ahead.
- Lane 1 exits and does not return.
- Lane 2 continues ahead.
- Lane 3 continues ahead.
What's new
The monster seen from below
What might it have been like to stand in one spot and witness the arrival, and the uncertainty, of plans for an urban motorway in West London?
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.
Have you seen...
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