Originally Posted by
teemuflyer
The speed limits in most of Texas on the Interstate Highways is 75 MPH (including I-45 between Dallas and Houston). Doing 85ish is basically the norm.
One cannot
average 85 (or 80) mph on I-45 between Dallas and Houston, except maybe at the dead of night. There are metro areas where such a speed is impossible. Also, I've encountered extended construction zones on every one of the too-many-to-count trips I've made on this route.