[fibonachos]

My wife’s 2015 Honda has a similar setup for the climate controls. One morning the windshield fogged up after a few minutes of driving when the cabin was warming up on a cold day. Not being my daily driver, I had to look low on the dash to find the defogger button, while driving in the rain. Nothing bad happened, but I remember feeling a little helpless in the moment. That nothing went wrong was really just pure luck.

[closewith]

You could always have pulled over.

[rnewme]

Once I was driving on a highway, in the left lane, in heavy traffic, entering a tunnel at some 140kmh, when due to enormous temperature and humidity difference literally blanked out all my windows and windshield. The tunnel had no ventilation and was filled with fog as well. It was literally as if someone hit a switch that turned off my screen. I started braking, turned in emergency light and toggled windshield fan all in less than a second. You could hear other people's tires screeching around me as well. I was in many hard situations on road and in life, but this was blood chilling. I hate to think what would happen if I wasn't able to get my windshield clear again so fast. I drove blindly for 2-3 seconds in a tunnel at 140kmh mate. No pulling over, no stopping with hazards on since guy behind you probably can't see you either.

[cafeinux]

You still have to see where you're going to pull over, and it's not always possible.

[jajko]

On highway, in dense traffic? Sure you can put the car in emergency lane, but that's a risky place to be increasing risk of accident on its own, plus traffic police comes immediately if they see you / are called for such car.

Another situation - narrow intercity winding roads, 0 room for safe stopping of car for next 2km. Again, asking for a crash especially in situation when your windshield fogs which is usually during heavier rain.

Yet another situation - driving in even semi-dense traffic in any bigger city. Again, no place to just stop and block others safely.

I could go on for a while. Not always the smartest move.