I personally wouldn't trust optical systems, but to be fair I've never driven a recent Subaru. The radar on my 2014 Volvo is extremely reliable, even in heavy r

I personally wouldn't trust optical systems, but to be fair I've never driven a recent Subaru. The radar on my 2014 Volvo is extremely reliable, even in heavy rain and I make heavy use of it in nearly all traffic situations. It only ever failed me once, and I can't blame it, since that was during the worst cloud burst I ever witnessed. The Autobahn went from "nice day with medium traffic" to "<2m visibility" in less than a minute, and literally everyone pulled over to sit that one out.