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General Motors operates several proving grounds.
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Desert Proving Ground Yuma
32.919818°N 114.323366°W / 32.919818; -114.323366

Desert Proving Ground Yuma is a facility co-built and leased by General Motors located within the US Army's Yuma Proving Grounds, near Yuma, Arizona. The facility came fully online as of July 2009. The site contains an inner facility sitting on 2,400 acres (970 ha) with a 24-acre (9.7 ha) campus containing 98,000 square feet (9,100 m2) of building area and also has 40 miles 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
42.583603°N 83.684449°W / 42.583603; -83.684449

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 4,000 acres (16 km²). 4,800 staff work in its 107 buildings today. The proving ground includes the equivalent of 132 mi (212 km) 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 5 miles (8.0 km) in the real world.
Cupuán Proving Ground
18.783056°N 102.168611°W / 18.783056; -102.168611

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.
Cruz Alta Proving Ground, Brazil
23.1425°S 47.269444°W / -23.1425; -47.269444
General Motors Cruz Alta Proving Ground at Indaiatuba, Brazil [1]

Testzentrum Dudenhofen
49.992777°N 8.923055°E / 49.992777; 8.923055
Opel operates a proving ground near Dudenhofen, Germany [3], opened in 1964. Facilities include a 4.8 kilometre high-speed circuit, a 900m section of Belgian pavé and a hill circuit with gradients up to 30%.
Arjeplog
66°4′10″N 17°58′58″EOpel operates a winter climate proving ground near Arjeplog, Sweden. Most of the tracks are on the lake ice. Arjeplog has an average temperature of −11 °C (12 °F) in January.
Lang Lang Proving Ground
38.353889°S 145.590833°E / -38.353889; 145.590833
The Holden Lang Lang Proving Ground is a vehicle testing facility located at Lang Lang in Victoria, Australia, approximately 90 km south-east of Melbourne.
It was opened in 1957 by GM-Holden and has been used to test every Holden model from the Holden FC onwards. It is a dedicated 877-hectare site with 44 kilometres of road systems, including a 4.7 km 4 lane circular track (speed bowl), 5.5 km ride and handling course, a 1.8 km noise road and 98m diameter skid pan. It is also equipped with an Emissions Laboratory and Safety Test Facility with crash barrier and hyge sled.[4]
Guangde County, Anhui, China
31.044266°N 119.425751°E / 31.044266; 119.425751
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.
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
33.324265°N 111.620192°W / 33.324265; -111.620192
GM Desert Proving Ground in Mesa, Arizona 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.