Or your dad could accept that he's going to travel a tiny bit further than he originally intended, and reroute with a u-turn, or a block circle, or a parking lot turn, or something similar. No invasive lane change. No need to apologise for an invasive lane change. No need for a special horn to communicate an apology for an invasive lane change. You don't need to apologise for something you don't make into someone else's problem.
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