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41 AutoData | June 2018 Disclousure/MBB fourteenmade of concrete, made to check structural durability, one of acoustic and thermal comfort and one off-road track. A total of 844 concrete slabs were installed, 5 m long each with varying widths and weight of 15 to 18 tons - are identical to those existing in the proving grounds in Germany and in the United States. The new proving ground is intercon- nected to the others which will allow en- gineers, in real time, to monitor all vehicles being tested at any of the three units, sha- ring all the data. thousand km driven on the test tracks are equivalent to 1 million km traveled on roads and streets test tracks form the complex: 14 especially for analyzes linked to durability and resistance. km is the total extension of the tracks, including 1,2 km of unpaved area to measure seal against dust and mud