As we can see most of the work on converting the M4 Junctions 8/9 to 12 to a four lane smart motorway is now complete. Asking why it is not open, I have been told that the Highways Agency has decided to introduce additional technology to detect stopped vehicles in a few seconds and to institute safety measures with lane closure and speed restrictions as necessary. There is a pause whilst this work is prepared and completed, when the full motorway will open between Junctions 12 and 8/9. The work from 8/9 to 3 is still underway, with more overnight closures to watch out for.
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