Indeed — I remember a projet in high-school, explaining how lidar were being used to measuring rain drops direction…

The thing is: there apparently now is a technology (at Mercedes or BMW) that uses beamers instead of front lights; a secondary camera detects droplets’ movement, predicts their fall and the beamer doesn’t shine light precisely on them. It helps light in front of you at night without shining mainly the rain. I was stunned when I learned we are now that fast. Same thing with cooking mosquitoes with lasers. I’m assuming that with those tech handy, a lidar should work properly through the rain. It leaves braking as a problem, especially on black ice — and that one is tougher.