off-road testing facilities at Millbrook Proving Ground from the air
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aerial photograph of the off-road testing facilities at Millbrook Proving Ground Bedfordshire England UK. Opened in 1970 by General Motors it is modeled on the General Motors Proving Grounds in the USA.GM sold the site and it now provides testing facilities to all manufacturers. The image shows the High Speed Bowl which is a two-mile long banked circuit used for high speed tests.