The message
from John Rumm contains these words:

My money is on them ignoring thinking time completely.

The timing kit worked by someone outside the car sending a signal that
both started the timer, and signalled the driver. the timer then ran
until the car came to rest. The equipment also recorded the distance
travelled from signal to stop. So it must have included some thinking
time - although I expect less than real world for someone who has been
plodding down a motorway for a couple of hours.

ISTR that in quick fire contests the total time from signal to shot can
be less than 0.1 seconds. Keyed up drivers could perhaps match that. So
I was wrong about not including thinking time but I remain convinced
that retardation rates much in excess of 1 g are outside the realms of
reality for normal road cars even on the best of road surfaces.

--
Roger Chapman