We have a number of online tools to help road users understand what is happening on the M4 Smart Motorway.
If you would like to know more about any upcoming work and trials taking place on the M4SM take a look at the interactive map to see what is planned.
View the M4 Smart Motorway map fullscreen.
The M4SM portal
This tool features interactive maps to see the changes occurring on the M4 motorway as well as project information, videos, images and a register for those wanting to receive project updates.
Check out our interactive portal.