Last year the news reported that people moving to Austin was adding about 500 cars per week. Believe me, the traffic here is awful. Just yesterday, we saw a moving tractor trailer rig with Florida plates following a car with Florida plates. There are cars here from every state, including Hawaii. Must have loved that car to have it transported here.
http://www.kxan.com/dpp/news/austin%27s-congested-roads-makes-top-20
FULL National Congestion Data for Your Corridor
http://mobility.tamu.edu/corridors/congestion-data/