I have seen similar messages on ours even under moderate to heavy rains, a lot depends on where and how the sensor(s) are mounted, in any case our system disengaged, and we had to manually maintain a safe speed.
By the way, I do not consider ANY car to be capable of self driving except in ideal conditions, and then they may only be marginal.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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