The updates include an additional 8.6km oval, new off-road test facilities, a noise pass-by area, and an improved 2.4km ride and handling track.
The Toyota Arizona Proving Grounds will become available to the broader industry as it opens its new Mobility Test Center.
One out of the 29 ever built, a 1955 Mercedes-Benz 300-SL Gullwing finished in aluminium went for a record US$4.62 million.
With only six units ever made, the XJ220S is expected to fetch at least US$225,000 when it goes up for auction at Arizona
