Originally Posted by Z K
On the track days where it rains, you never want to track with the windows down. You get yourself and everything inside soaked.
Most track day organizers will allow windows up on rain days and use the turn signals as point-by indicators.
First I've ever heard of this, but then again, I'm new to US tracks... Never been allowed to roll with the windows up (nor would I). Never been to a heavy rain day at the track, so can't say from experience.