South Florida is a total car culture, especially out in the 'burbs. I'm not worried about getting warmed up on the way to work. I am sweaty enough when I get there, and I'd rather get there 20-30 minutes early in order to cool down and change. I figure any day I ride instead of drive is good for me and the environment. I use after work to get a bit more of a workout in, but in this heat, it doesn't take long to get warmed up.