I visited Dallas (EDIT: I was in Houston, actually) during the summer and saw, gasp, zero cyclists. And no wonder. I've never seen such an inhospitable place for cycling... Perhaps it had to do with cars running at 50 mph on surface streets with no shoulders, bike lanes, or even WOLs. Or maybe it was that unrestrained growth and a certain catering to the automobile above all other forms of transportation (there weren't even sidewalks in many places) has placed all locations a minimum of 5 miles apart. It took an hour on the freeway to just cross the urban center (in a car); the city is probably 50 miles across. Commutes must be 20 miles minimum!
EDIT: I made a mistake. I was in Houston during the summer, not Dallas. From what I've heard, there's not a significant difference in terms of bicycling culture or environment. You tell me. Is Houston much different than Dallas[/size]?