When I see a car in the other lane (going in my direction) stopped way to far in advance, I look at its usually a blue hair granny or, someone checking their cell phone.
Along those lines, when I pass a car going very slow and the other driver is looking down at their phone I lay on the horn for a split second (not just a polite beep). They look up shocked and look around to see what happened. If ever challenged, I would truthfully state I was worried that the distracted driver might have veered into my lane. Hey, pay attention
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Joe
See Porsche run. Run, Porsche, Run:
`87 911 Carrera