The speed of the handbike was therefore within the allowed limits and the same for the truck which was traveling at 39 km per hour. This is what emerges from the collimating evaluations present in two deposited advice in the chancellery of the Public Prosecutor’s Office of Siena: that of Professor Dario Vangi, consultant of the chief prosecutor Salvatore Vitello and of the prosecutor Serena Menicucci, and that of Professor Mattia Strangi, part expert for the defense of the hauler from Castelnuovo Berardenga (Siena) , currently under investigation for negligent injuries.
In the dynamics of the accident described by professor Mattia Strangi, professor of road accident reconstruction at the University of Bologna, when Zanardi saw the truck coming in the opposite direction he would have tried to turn to the right to move away from the central part of the roadway but his vehicle would be went oversteer, that is, it would have had a head-to-tail principle that would have caused the vehicle to overturn. Zanardi thus falls, ending up in the opposite lane and hitting his head against the left front rim of the truck.
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