Millbrook consists of roads, tracks, buildings and countryside.
Millbrook Proving Ground is celebrating 40 years in the motoring industry.
The Bedfordshire site is Europe's leading location for the development, test and demonstration of every type of land vehicle including military.
It is also a regular location for TV shows Top Gear and Fifth Gear and featured in the James Bond film, Casino Royale.
The 400 employees at the track will celebrate its 40th birthday with a series of special events.
Modelled on the Milford Proving Ground, in Michigan, USA, the 700 acre site was constructed in the 1960s by the Vauxhall Motors.
The two mile five lane high speed track came into use in 1969, and construction of other sections continued into the early 1970s.
Once opened, Millbrook acted as the testing site for many European GM models from, amongst others, the Vauxhall and Bedford companies.
Jeremy Clarkson drives a truck through a wall at Millbrook
Millbrook has a wide range of test tracks. The most prominent are the:
• Hill Route - divided into three sections or loops which contain progressively steeper gradients and tighter corners. This section was used for the James Bond film Casino Royale, which sees Bond flip his Aston Martin in mid air and roll it seven times - a stunt which earned a place in the Guinness Book of World Records.
• Outer and Inner Handling (or City Course) circuits - extremely technical twisty circuits used for extreme testing of vehicle handling characteristics.
• High Speed Bowl - a two mile circular banked circuit used for high speed testing.
The BBC Top Gear team regularly test the latest supercars at Millbrook and carry out stunts.
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