[RowanH]

Yes - when you get motion sickness badly it's amazing how bad it is and how long the effects last.

I experienced incredibly bad motion sickness at a racetrack once; the ole "vestibular disconnect". I had been gradually improving lap times and went to one circuit which was continual left-right-left-right sequence of corners with very little let up (cornering G's around 1.5). After 3-4 laps I had the cold sweats and had to get out of the car... I tried 3 different sessions to shake it and couldn't. Was dizzy for the remainder of the day wanted to throw up constantly. A good sleep and I came right. The dizziness was horrible - you definitely wouldn't want to have that experience then go on to operate heavy machinery :)

In my understanding talking to a scientist friend in that field - everyone has different tolerance levels, but when it happens and your body goes into "caveman mode" the results are horrible. The underlying message in the authors answer (my read) is it's "be careful... you can really mess someone up".

After that incident at the track my empathy for motion sickness went up a few notches..