Global Motorsport Media
Actual 'vertical construction' at the 2012 US Grand Prix venue in Texas has not yet begun.
The local Austin American Stateman reports that work on the buildings and grandstands cannot begin until nearby road improvements are done.
A spokesman for the Texas Department of Transportation confirmed the news, as did Circuit of the Americas spokesman Jeff Hahn.
The report said the road works will not be completed until October, just over a year before the track is scheduled to host its inaugural Grand Prix in November 2012.
The Austin American Statesman said the pace of work at the site recently "slowed dramatically" but never "completely stopped".