It was one of the key episodes of the Abu Dhabi GP, Fernando Alonso's Ferrari had to take to the curbs to avoid contact with Jean Eric Vergne's Toro Rosso as he tried to beat Massa back onto the track after a pit stop.
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What happened? F1 regulations state that a driver must be checked out at a hospital is a g-force sensor alarm, installed in every chassis is triggered. The sensor is there to alert medical personnel of the severity of an accident and is triggered at 18G. Well placed journalists like the BBC's Andrew Benson reported the sensor had measured a whopping 28G.
28 G is a heck of a hit, for reference what happens when when a pickup truck slams into a solid wall at 30 mph. The Ferrari tub and Alonso's butt are very strong but perhaps the real figure was much lower as suggested by Autosprint who say the sensor came loose and registered a much higher energy spike.
Ferrari has had no comment either way.