I passed a vehicle driving through our neighborhood that had some kind of scanning system mounted on it:
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It was setting off both the laser and radar detectors in my 4Runner, so I'm guessing it had a LIDAR system as well as
radar. I don't know if it was mapping the terrain, or if it was an experimental prototype for a self-driving car.
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That's likely some sort of autonomous car engineering mule. I used to see them often when I lived in Michigan. The dome is some sort of laser scanning terrain mapping device and there are pairs of cameras everywhere to allow the computer to see three dimensionally.

