Why do these threads always turn into law suits, don't see the same happening when people change their exhausts to decat systems. I'm sure the OP is aware of law implications, visibility dangers etc etc.
I think we're old enough to make our own decisions on here.
Lets be sensible. If we did EVERTHING as per the book, none of us would:
Exceed any speed limit, anywhere, anytime.
Modify our cars in ANY way
Use our phones AT ALL whether it be bluetoothed or otherwise
Wear Sunglasses whilst driving
Smoke whilst Driving
Eat/Drink whilst driving ( non alcoholic of course)
Take our eyes off the road while we shout at kids in the back
Wear dark Visors on Motorbikes
Small Reg Plates
The list goes on and on.....
Going back to my windows, I can see perfectly well during the day, and if at night it was bouncing down, or foggy or whatever, I would drop the windows to allow me to see. I for one , don't want a 17 year old kid in a Corsa with dicky headlights, stoving into the side of my 507.