The "240" system works almost as well - and you can still hear the radio!
I still remember my dad cussing the engineer who took the vent windows out of his 71 Dodge Demon. His air conditioner failed. We were driving to the lake on the expressway with all the windows down. He was muttering to himself ,"75 mph with all the windows down and you could light a MFing candle and put it on the daskboard." The backseat was windy as hell but the fronts seat was devoid of wind.