--- On Mon, 10/5/09, Guy R Day <grday@btinternet.com> wrote:
> Semis have their own rules and dual rotational centres and
Exactly. When a trailer starts to jacknife, you hit the emergency bar and lock 
the rear wheels intentionally. On a race car, you dial in the brakes by 
starting with severe front bias, and dial it backwards until the tail gets 
unstable, and go back a notch towards front.
Ron
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