Judy,
There is a big underground parking garage across the street from the convention center. I'm not sure how much it costs or how fast it fills up. It used to be a surface parking lot. Then three years ago, they dug it up and put a multi-level parking garage
underground then built a really cool park with a boat pond, fountains, and an ampitheatre. It is a great park. Last year was the first show with the park done. I can't really tell you much about the traffic because we come into Houston in the mid-afternoon. We stay at the Hilton and almost never take the car out of the garage. During peak traffic times, it is bad, but not as bad as LA. I've been both places at traffic times
Frances