I'm very attentive to the cars around me when driving. If I see the same set of headlights in my rear view mirror for an extended period of time I get suspicious real quick. I will trigger my turn signal, if the car behind me does the same thing, I will continue going straight, if the car continues to go straight as well, then I know its following me. Or I'll do the opposite, no signal and then make an immediate turn to see if the car in question attempts the same maneuver. This has happened to me a couple times, and I've diverted it every time.
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