[Porsche-O-Phile]

Pretty much the entire central valley is best traverssed as quickly as possible, windows rolled up and plenty of air fresheners on hand.

Better still, it's traverssed by aircraft. Gets you away from it as quickly as possible, you're above the "smell layer" inversion and you don't need to worry about getting run off the road by some redneck drunkard or that pickup truck full-o-thirty illegals (with no insurance, of course).