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You know, if you like you can speed up to 300km/h on german ‘autobahnen’, it’s legal! And German Porsches are simply too fast for reflex arcs of the sensorimotor human brain. So Stefan Haufe and his colleagues at the Berlin Institute of Technology measured brain wave changes while participants drove in a car simulator to find shunts to tame the shrew, to shorten reaction times.
They assume, that “driver’s intention to perform emergency braking can be detected based on muscle activation and cerebral activity prior to the behavioural response.” They did not test their system in real life conditions, where the measurement could have been polluted by funny muscle artefacts, sensory stimulation like radio or annoying passengers. Their simulated assistance system using brain electric activity (EEG) and muscle activity (EMG) “was found to detect emergency brakings 130 ms earlier than a system relying only on pedal responses.” This shortens the stopping distance at 100 km*h−1, which is about 78.95 meters  by 3.66 meters.

It’s good to know that as a rule of thumb you can achieve the same effect by reducing you driving speed form 100 to 97,32 km*h−1.

Ref.: Stefan Haufe et al 2011 EEG potentials predict upcoming emergency brakings during simulated driving, J. Neural Eng. Vol.8, No.5, doi: 10.1088/1741-2560/8/5/056001