If you were behind a car at the lights when they had turned green, would you sound your horn to wake him up? How long would you wait? What about if you were following a car on a rainy day and his fog lights were on? (Silly one that - I know it never ever happens! Why would a driver put his fog lights on if it wasn't foggy
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Or do you worry that the driver will get out and thump you one or if it was a woman driver in front would you refrain to avoid frightening/alarming her?