Also note, Elon Musk previously addressed this specific situation [1] [2],
> Radar sees through rain, fog, snow, dust, and essentially quite easily. So even if you are driving down the road and the visibility was very low and there was a big multi-car pileup or something like that and you can't see it, the radar would and it would initiate braking in time to avoid your car being added to the multi-car pileup.
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[ 3.9 ms ] story [ 13.9 ms ] thread> Radar sees through rain, fog, snow, dust, and essentially quite easily. So even if you are driving down the road and the visibility was very low and there was a big multi-car pileup or something like that and you can't see it, the radar would and it would initiate braking in time to avoid your car being added to the multi-car pileup.
[1] https://insideevs.com/elon-musk-on-autopilot-8-0-if-the-car-...
[2] https://electrek.co/2016/09/11/elon-musk-autopilot-update-ca...