little snipet from Toyota's site about the proving grounds:
Originally posted by "www.toyota.com":
Toyota Arizona Proving Grounds
With one of the world's largest test tracks, the Toyota Arizona Proving Ground (TAPG) is home to one of TTC's Vehicle Evaluation departments. Unveiled in 1993, TAPG provides facilities for rigorous performance durability tests under the harsh conditions found in the Arizona desert.
Members of the Vehicle Evaluation department at TAPG use the facility's 10-mile high-speed oval track, ride and handling course, dirt course, straightaway, brake test area and steep grade area to simulate just about any road and driving condition around the United States.
At the Proving Ground, TTC professionals conduct a range of durability tests, incorporating all facets of motoring - from city and highway driving, to parking in the hot sun. The group tests and evaluates ride comfort, handling characteristics and trailer towing capabilities. In addition, the Arizona team conducts heat-related tests and rough-road reaction tests, as well as cold weather tests at off-site locations.
