Route
Junction number
None
Markerpost
136.7 km
Name
Sideway Interchange
Type
Non-standard interchange
Terminus
Terminus at end of exit list
Other routes
A500, A5006
Authority
Restricted turns
Full access
Services
No services
A50 Sideway Interchange
Layout and signage
Lane configuration
- Lane 1 is gained from the entry sliproad.
- Lane 2 continues ahead.
- Lane 3 continues ahead.
- Lane 4 continues ahead.
- Lane 1 exits and does not return.
- Lane 2 exits and does not return.
- Lane 3 exits and does not return.
- Lane 4 exits and does not return.
Other events
50mph speed limit begins
- 50mph speed limit begins
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...
M1 Architecture
The most unique motorway in Britain owes its identity to its fifties architecture. Much of it is in danger of being removed or irreperably altered. This page documents it in detail.
About this page
Published
Last updated
Published
Last updated
