General Motors proving grounds

One of the main reasons that this site was chosen was the already imposed no fly zone which helps prevent unwanted photography of pre-production prototypes undergoing testing.

The General Motors Milford Proving Ground was the industry's first dedicated automobile testing facility when it opened in 1924.

The proving ground includes the equivalent of 132 miles (212 km) of roads representative of conditions found on public roadways and other specialty surfaces for vehicle testing.

General Motors Proving Ground Cupuan del Rio is situated between Lázaro Cárdenas and Uruapan, Michoacán, Mexico.

The facility opened in 2006 and features a circle track, several off-road courses, and is primarily used for testing HVAC systems.

Opel, which since 2021 is not owned by General Motors, operates a winter climate proving ground near Arjeplog, Sweden.

[8] GM's proposed facility at Mezcala, Mexico was terminated in the planning phase due to breakdown in land negotiations.

GM Desert Proving Ground in Mesa, Arizona, USA was a General Motors facility for the testing of HVAC, propulsion, and various automotive systems in a harsh climate.