One of the nice things about the toll roads that circle Austin is the fact that few people use them. Too far from town to be viable alternatives to IH35, MoPac or 71, another reason for nonuse is the fact they were built with public money. They were then sold to a Spanish company. It's easy to protest because of the distance.
But for $3 you can hop on and haul ass. I've had the car doing sub 23 second miles.
The new 85 mph portion will have more traffic than the Austin portion at first. After a while a lot of the truck traffic will go East of Austin.
http://news.blogs.cnn.com/2012/09/07...?iref=obinsite