"The University of Phoenix Stadium, home to the Arizona Cardinals football club, sets a new standard for covered stadiums, with cutting-edge architecture and state-of-the-art operable roof and field structures. The stadium is the second NFL facility to feature a retractable roof and the first in North America to feature an operable playing field. It is also the first retractable roof in North America to ride on inclined rails and its two main 700’ long lenticular roof trusses provide the longest clear span of any retractable roof stadium in operation in the United States today. Another signature achievement was realized when a 5,400-ton section of the roof structure was assembled on the ground and lifted into place as a unit in February 2005..."