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Reminds me of a story of a large diesel who started sliding back down a slope, stalled it and when it restarted he gunned it......without realizing it had bump started and now the engine was running...

These signs don't always work.

Got into a multistory carpark in a long wheelbase van passing clear under the sign, got stuck on one of the ramps as the angles reduced the available height...

Amateur - Hit wing mirrors up or down, they are designed to be hit back and forward!