11.   Warren Platt, a lawyer representing Ford, maintained that driver error caused the accident.

12.   While road conditions contribute to nearly a third of them, driver error is a factor in almost every crash.

13.   While the cause of the crash has not been determined, investigators are expected to focus on driver error or signal failure, newspapers reported Wednesday.

14.   Police were investigating whether driver error or mechanical problems caused the crash.

15.   Birmingham police told the Detroit Free Press that initial information indicated driver error was the cause.

16.   But Porsche chiefs could only look on as driver error and mechanical failure left both cars in the pits for more than half an hour as dayliught came.

17.   Jack Lang, executive director of the Indy Racing League, ruled out driver error.

18.   More than three-quarters of all accidents are to due to driver error, according to the National Highway Traffic Safety Administration.

19.   Officials have determined that the accident was caused by mechanical failure and driver error.

20.   Officials said the accident was caused by mechanical failure and driver error.