You use it to signal your presence to other drivers when you're concerned they might be unaware of your presence or unaware that you are going to be moving. If you don't blow the horn until someone has done something that you disapprove of then it's too late for it to have any benefit.
You use it to signal your presence to other drivers when you're concerned they might be unaware of your presence or unaware that you are going to be moving. If you don't blow the horn until someone has done something that you disapprove of then it's too late for it to have any benefit.
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