General Motors Desert Proving Ground

From wikipedia:
By December, 2003 the last 78 EV1s in storage had been transferred to the GM Desert Proving Grounds in Mesa, Arizona for disposal, much to the protest of their former drivers. All EV1s sent to this site were stripped of their recyclables and crushed.

From AZRepublic.com:
General Motors was the first to open a proving grounds in Arizona, starting its original hot-weather testing facility on a 5-acre site in what is now central Phoenix in 1937. The automaker moved in 1953 to the 5,000-acre Desert Proving Grounds in southeast Mesa, where it stands as the oldest automotive proving grounds in the state. Ford's 3,800-acre testing center near Kingman opened in 1954.

The landmark GM facility has seen essentially every car and truck made by the company in the past half-century, from the original Corvette to today's Cadillac Escalade, and every exotic prototype and experimental vehicle. The proving grounds include a famous banked, 5-mile circular track, a maze of rough roads and broad asphalt lots, and a number of offices, shops and laboratories.