11.   Schumacher hit a tire wall on the first lap at high speed, breaking his right leg in two places and probably ending his Formula One season.

12.   Schumacher, whose accident is believed to have been caused by a loose bolt on the rear brakes, plowed into a tire wall at high speed.

13.   The tire maker also told investigators there was a problem with the wedge area of the tire, located near the shoulder where the tread meets the tire wall.

14.   The two first touched wheels, then banged together, with Herta sliding off into a tire wall.

15.   Then, last week at Vancouver, Zanardi bumped Herta out of the lead and into a tire wall while charging back from a lost lap.

16.   Zanardi, who crashed into a tire wall in qualifying on Friday, did it again Saturday, hitting in almost the same spot midway through the session.

17.   The race turned on a caution period caused by Brazilian rookie Andre Ribeiro hitting a tire wall.