Saturday is shaping up to be a big day at the Circuit of the Americas. On Friday, about 65,000 fans showed up to take in the practice rounds for the U.S. Grand Prix. But a circuit official said that by 10:30 a.m. today, about 35,000 fans were onsite, and over the last hour even more have poured in.

The grandstands and hills are significantly more packed than they were on Friday. In addition, some of the pedestrian bridges on the track took as much as 20 minutes to cross.

http://www.statesman.com/blogs/content/shared-gen/blogs/austin/racing/entries/2012/11/17/big_turnout_expected_for_day_t.html/