Thanks for all the suggestions. I was on I70 in close to the Indiana/Illinois state line (cant recall which side I was on at the time - I'm going to say Illinois, heading west). If this happens again I'll look out for the Audi or Merc; I dont know what range their radar cruise controls work over, but I'd imagine it would have to be pretty close. And given that this was over a fairly long stretch of road, I think I would have noticed the pattern - but I'll pay more attention next time. My recollection is that the arrows would fluctuate during alerts - somewhat erratically.




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