Route
Junction number
4
Markerpost
25.0 km
Name
Airport Interchange
Terminus
Not a terminus
Other routes
A408
Authority
Restricted turns
Full access
Services
No services
M4 J4 Airport Interchange
Layout and signage
|
Uxbridge Heathrow  T2 & 3A408 |
(A408) | 
|
(A4) |
Heathrow T2 & 3 Uxbridge A408 |
Lane configuration
- Lane 1 exits and does not return.
- Lane 2 continues ahead.
- Lane 3 continues ahead.
- Lane 4 continues ahead.
- Lane 5 continues ahead.
- Lane 1 is gained from the entry sliproad.
- Lane 2 continues, with option to exit.
- Lane 3 continues ahead.
- Lane 4 continues ahead.
- Lane 5 continues ahead.
Other events
Variable Speed Limits apply
- Variable Speed Limits apply
What's new
Hello, here's my ridiculous side project
An introduction to what I write, and why I write it, and where my strange new road sign simulator fits in to all this.
London, in a new light
It was specially designed never to be noticed. And now it's disappearing, nobody has noticed its absence. It's London's own bespoke street light.
The Ringways Map is here
The wait is over! The full map of the Ringways, London’s unbuilt urban motorway network, is now online. Not even the system's planners had anything like this.
Have you seen...
Sir James Drake
County Surveyor and Bridgemaster for Lancashire in the 1950s and 60s, Drake was instrumental in the motorway revolution.
About this page
Published
Last updated
Published
Last updated
