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Honking at someone when the light turns green is no longer rude because he is probably on his phone
(self.showerthoughts)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
The only polite way is to lay on the horn non-stop while following them to their destination (so they know you're there), when they stop, get out, approach them as quickly as possible (to be respectful of their time) to thank them for going
This is generally accepted in any situation and is loved by many drivers.