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I once went past a nasty crash on the M25 near Clacket Services. The opposite carriageway was closed, quite reasonably, as a couple of cars had smashed through the wooden fence and tumbled in a field. They had screens up by one vehicle so I presume their were severe injuries or fatalities.
There were emergency vehicles on the hardshoulder and lane 1, but all the wreckage was all in the field. I heard on the radio that the air ambulance landed on the carriageway, so no complaints about the closure.
However I listened to the traffic reports as the south side of London was getting into severe gridlock, and the carriageway was still closed four hours later! Ridiculous.
The government claimed when setting up these highway patrols that it was going to help re-open roads more quickly. No chance.