Unless you subscribe to some pretty outmoded ideas, the real world is rarely flat. Hills, dips, crests and a vast range of other 3D road features all create dynamic situations for which it is difficult to optimize a chassis using 2D test surfaces. Public roads have hills, but are particularly unsafe for this type of development, and repeatability is notoriously poor. Computer models are repeatable and can help to compress development times, but are only as good as the data on which they are built.
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