My teams and I have developed automotive radar for adaptive cruise control and collision avoidance for several decades. They generally operate at 76-77 GHz with only milliWatts of power and significant frequency modulation. The range is typically up to 150 M. Furthermore, with high gain antennas, the millimeter-wave beam is very directional and the power is readily absorbed in the environment. There should be no concern about interference with other users of this spectrum.
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