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JEDE3 said:
No such thing as negative acceleration. The closest thing of accomplishing that feat would be staying completely still. Not even a twich.

Ok I think this is geeting a little pedantic. The rate at which an object loses speed can be measured as deceleration. Hence in Forza 3, the game will cause your car to decelerate (slow down at a rate of 'x' m/s at any given time) when it needs to.