An 85 mph speed limit sign is placed on the 41-mile-long toll road in Austin, near the increasingly crowded Interstate between Austin and San Antonio, Texas on Thursday, Sept. 6, 2012.

Ten campers and their 19-year-old counselor are among those still missing from Camp Mystic, where 27 died in one of the deadliest U.S. floods in decades. More storms are forecast overnight.