
General Motors proving grounds

General Motors operates several proving grounds.
North America.
Desert Proving Ground Yuma.
Desert Proving Ground Yuma is a facility co-built and leased by General Motors located within the US Army's Yuma Proving Ground, near Yuma, Arizona. The facility came fully online as of July 2009. The site contains an inner facility sitting on with a campus containing of building area and also has of roadway. 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 facility is also used by the US Army for their own testing requirements.
Other such features are:
Milford Proving Ground.
The General Motors Milford Proving Ground was the industry's first dedicated automobile testing facility when it opened in 1924. It is located in Milford, Michigan and covers . 4,800 staff work in its 142 buildings today. The proving ground includes the equivalent of of roads representative of conditions found on public roadways and other specialty surfaces for vehicle testing. Some roads are open only to drivers who have passed special performance driving training. The saying goes that each mile driven on the grounds is the same as in the real world.
Cupuán Proving Ground.
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.
As of 2011 the grounds are mostly abandoned, and only a local security staff remains. This is due to the volatile, potentially unsafe situation in the region and the access routes to/from Cupuán.
South America.
Cruz Alta Proving Ground, Brazil.
General Motors Cruz Alta Proving Ground at Indaiatuba, Brazil 
Europe.
Testzentrum Dudenhofen.
Opel operates a proving ground near Dudenhofen, Germany , opened in 1964. Facilities include a high-speed circuit, a section of Belgian pavé and a hill circuit with gradients up to 30%.
Arjeplog.
Opel operates a winter climate proving ground near Arjeplog, Sweden. Most of the tracks are on the lake ice. Arjeplog has an average temperature of in January.
Australia.
Lang Lang Proving Ground.
The Lang Lang Proving Ground is a vehicle testing facility located at Lang Lang, Victoria, Australia, approximately south-east of Melbourne.
It was opened in 1957 by Holden on a site off the Bass Highway. It was used to test every Holden model from the Holden FC onwards. It is a dedicated 877-hectare site with of road systems, including a 4 lane circular track (speed bowl), and handling course, a noise road and diameter skid pan. It is also equipped with an Emissions Laboratory and Safety Test Facility with crash barrier and HYGE sled.
In February 2020 GM announced the test track and design centre would close with all jobs being redundant to reflect the GM decision to quit global right hand drive vehicle production. In September 2020, it was sold to VinFast. It will continue to be used by GM Speciality Vehicles.
Asia.
Guangde County, Anhui, China.
Shanghai GM (SGM) and Pan Asia Technical Automotive Center (PATAC), both joint-ventures of SAIC Motor with GM China, opened in September 2012 China's largest proving ground in Guangde County, Anhui, China.
Proposed / Closed Proving Grounds Facilities.
Mezcala Proving Ground.
GM's proposed facility at Mezcala, Mexico was terminated in the planning phase due to breakdown in land negotiations. The facility was to take over Desert Proving Ground tasks when GM announced DPG's closing in 2000. DPG is still operating as of late 2008. Soon to be closed and replaced with the new facility in Yuma, Arizona.
Desert (Mesa) Proving Ground.
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. Opened in 1953, the closure of this facility was completed in 2009. It was replaced by a new facility in Yuma, Arizona, known as the Desert Proving Ground Yuma.