Cruisecontrol.
"I take your point about the M25 but have you seen the M27? For most of the day it's unbelieveably busy and for much of it, at a total standstill."
In my experience, that statement is factually inaccurate. We've been here since August and I use the M27 between J9 and J5 on a very regular basis, at various times of the day. The eastbound exit at J9 after about 16:00 can be slow and the westbound stretch between Botley (J7) and the airport (J5) can be slow up until about 09:30. Outside these times it has been as wide open as any other motorway. Sure, if there is a prang then general rules apply.
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