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
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