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@Armorel: you are absolutely right - the question was maybe closed a little soon; but I have to say that "reaction time" can also be applied to the brakes themselves, and it was a bit amiss of me not to include an appropriate reference in that direction.
Shouldn't this question have been left open longer before grading? You have chosen "reaction time" on the basis of a single reference to driver reaction time - the time taken by the driver to respond - this is quite different from the time needed for the
"Brake factors must also be considered when reconstructing a truck accident. The two most important factors are brake balance and brake lag time (...)
Another brake factor to consider when reconstructing a truck accident is brake lag time. The two kinds of brake lag are mechanical lag and air-pressure lag. All brake systems have mechanical lag or a slight delay in the buildup of brake force after the brake pedal is applied." http://www.johncglennon.com/truckcrashreconstruction.cfm