11.   As is sometimes the case, the section had been closed temporarily to walkers to prevent an accident.

12.   Bill Hutchinson defended the bonfire tradition and the safety precautions students like his son take in the hopes of preventing accidents.

13.   A burst tire was blamed, and to prevent similar accidents, the plane now has tougher tires and Kevlar-lined fuel tanks.

14.   A top mayoral aide who is leading the investigating commission, Dennison Young Jr., said the panel was exploring a number of options to prevent such accidents.

15.   Accidents often occur because warning signs were ignored, and dozens of recommendations to prevent future accidents go unimplemented every year.

16.   According to administration officials, the American experts provided crucial data and information to the Chinese to prevent future accidents.

17.   Almost immediately investigators requested a Hazardous Material Report, setting in motion a warning intended to prevent an accident.

18.   But dangers still exist, and efforts aimed at preventing further accidents should be accelerated.

19.   But instead of smashing into the oncoming northbound traffic, the vehicle slammed into flexible steel cables installed to prevent crossover accidents.

20.   But the government also called for new cockpit instruments and for changes in navigation charts and computer software that it said would help prevent another accident.