Sébastien Buemi's accident.
Upright failure caused Buemi's crash
Sebastien Buemi's spectacular accident in practice for the Chinese Grand Prix was caused by the failure of the front right upright.
The tires flew over the spectator fences because the tethers were attached to the part of the uprights that broke off.
Toro Rosso will fit uprights from a previously used proven design to both its car from second practice in Shanghai.
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