U.S. Grand Prix
Workers have excavated about 85 percent of the Circuit of the Americas track near Austin and they expect to start putting down the first layers of asphalt in April.
The U.S. Grand Prix has been included on the 2012 Formula One calendar, despite fears that the race in Austin would be cut for financial reasons.
Organizers of the proposed U.S. Grand Prix in Texas face a Wednesday deadline to guarantee its long-term financial backing or lose the race for 2012.
Formula One boss Bernie Ecclestone says the U.S. Grand Prix could be removed from the 2012 calendar because construction of the Texas race track was halted.