Per Muggles:
Any time wipers are on? hmmm About half the people on the road here
MIGHT turn on their lights if it's raining. I usually do it, though.

On my first trip to Germany I was at the airport waiting for my ride and
noticed that the cars all had windshield wipers on their headlights.

WTF ? Thunk I.

A half hour later, I found myself in the passenger seat of a car doing
110 MPH in the rain at night....

Question answered....
--
Pete Cresswell