Originally posted by monochrome Cars are a closed environment witha lot of glass, so the internal temperature rises to 170+ degrees almost immediately when in full sun, regardless of the paint color. Apparently the largest controllable variable is whether the car has tinted windows
I agree - you can quickly feel how hot the exterior paint of a black auto is. On the other hand, most of us don't ride on the outside of the auto .....
In another and (perhaps) more serious vein, a building's roof is rather static. A moving auto, OTOH, is shedding heat by conduction as the "moving" air carries the heat away as well as by radiation.
If California were really worried and had a legislature with a slightly smaller proportion of the victims of modern education, they'd figure out that the real improvement would come from banning black tarmac streets and car parks, replacing them with white concrete. I'm filing a patent tomorrow from my shell company in Tyler, Texas. (That last sentence really does make sense if you've been following the legal/IT news this week.)