16 September 1997 The Senna trial restarts after the summer break. Michele Alboreto testified today and said that a F1 driver would only leave the track at the Tamburello as a consequence of a mechanical failure. He also said that the normal movement of a steering wheel is 2-3 mm, if they were more the driver would know immediately as his hands would hit the chassis. After seeing the images from Senna's on-board camera Alboreto said that he is convinced that the accident was caused a by a mechanical failure. He added that he has seen a video which proves that Senna's steering wheel was moving by as much as 3 cm and if this video is accepted as evidence, it will prove that something was seriously wrong with the Williams. No steering wheel ever moves by centimeters, he concluded.