Weather conditions

Snowed hard enough to close the freeway 20 miles from the track. In southern AZ.

Granted, this was on the Friday of the race weekend, but they didn't cancel that one. SNow and ice at trackside when the green flew Sat, after the coldest camping night of my life

If the question is really how much of the car bad weather functions should be preserved then the answer is all of them. Eventually you will need wipers, defroster, heater and you will be grateful for having headlights and taillights. The race will stop to protect the corner workers, wreckers and track crews. At Atlanta in 2017 the start was delayed until the track crew could verify that ice had melted off the track surface. But once we started racing you didn't want to get far off line because of the ice forming on the edges of the water running across the track. At Charlotte, Sebring and this last Atlanta race there were periods of rain and other car spray that limited visibility to a couple car lengths. I was thankful for cars with front and rear lights in those races.

I consider those two so essential I would even leave the wiper stalk and center dash if at all possible in your car to guarantee they still work.

If you have to lose the defroster, buy the clearview grid defroster system and install it after the cage is done.

Oh man that race was just so much damn fun. Our radio channel was full of drivers complaining about how terrible it was and why were they even doing this, and I would just laugh each time I lapped them. We love the rain, bring on more rain. CT last year on sunday was equally enjoyable for similar reasons.