Can you put transitions lenses on your car windows?

The technology is surprisingly expensive, still. But the biggest problem is that photochromic glass is guaranteed to last at most two year on eyewear, which on cars would probably mean a few months, and even less if the car is not garaged.

Another problem is that it has a slow reaction time, especially when turning back transparent. This means that if you drive outside during the day and then enter a tunnel, the Windows will stay dark.

A better alternative is electrochromatic Windows, whose darkness can be controlled at will. These are even more expensive, and so far it appears they only sell commercially for Ferraris