There's also a different solution that e.g. Russia employs: honking is completely prohibited except for avoiding a collision. Of course, people still honk occasionally when annoyed, and, notably, to call someone outside the traffic; and the rule isn't enforced much—but its mere existence raises the threshold considerably. You have to really be in the way to earn a honk, twenty seconds is an unthinkably low cutoff here indicating anger problems on the honking driver's part.