Before they built a bypass section on the M4 in South Wales, there was a section that used to drop onto A roads with roundabouts and then it became the M4 again. You can imagine this got snarled up at rush hour.
People used to often use the hard shoulder to cheat and push in on the roundabout. Except one morning a police officer had parked his car at the end.... so he then walked down the line and booked all the people illegally using the hard shoulder :-) They could not get away because he was blocking the way.
What would have happened that morning if there was an emergency mind. I think use of the hard shoulder by locals ceased after this happened a few times.
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