Neat, but I've yet to see a demo of a self-driving vehicle in rain so hard drivers slow down from 65 mph to 45 mph, the wipers at their fastest setting are struggling to keep up, and when you drive through a puddle, the splash from the water obscures the windshield for a couple seconds. Conditions with such low visibility from the rain coming down so hard that you wish you had a clear view screen (also called spin window) [1], usually found on ships and machine tools that use lots of liquid. Humans regularly drive through this kind of rain, though not well. If a self-driving platform relies exclusively upon LIDAR, my understanding is seeing through this much rain requires a lot more processing.
The rain demos I've seen [2] [3] [4] are all in wet weather, but not this kind of heavy rain, where a promise of self-driving technology saving lives and property can be more assuredly realized. If anyone in the field knows of one of the contenders already working on training in such poor conditions, then please post a link to a demo if one is available.
[1] https://en.wikipedia.org/wiki/Clear_view_screen
[2] https://www.youtube.com/watch?v=xs9Gr9V2mOE