Pretty much the same with the M4 between the M5 and the M32 - when in use limited to 40 or 50 mph. Too much traffic for inconsiderate stupid speeders to put lives at risk - no room!
More than that - they should be made to go and play on them - in the dark - wearing black hoodies!
OK, maybe not quite that, but they should certainly lose their doubtless well paid jobs. Maybe be made to go and assist with clearing the wreckage from a fatality (call it a team-bonding...