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dAccelerate and dSteering are not clamped
In car.cs at lines 225 and 229 the function MathHelper.Clamp is used incorrectly: the function does not clamp the first argument but it returns the clamped value.
Change those lines as following:
dAccelerate = MathHelper.Clamp(dAccelerate, -deltaAccelerate, deltaAccelerate);
dSteering = MathHelper.Clamp(dSteering, -deltaSteering, deltaSteering);