The road construction may not be the real reason for the construction stoppage/slow down. Something is suspicious...
ByJohn Maher and Shonda Novak
AMERICAN-STATESMAN STAFF
A noticeable work slowdown at Austin's Formula One racetrack site and a possible change in the track's promoter or management is raising new questions about the future of the circuit and the ability of developers to meet a tight construction schedule with the inaugural race now 14 months away.
http://www.statesman.com/news/local/slowdown-raises-questions-about-future-of-f1-1887471.html