31.   If a bus fails, it is taken out of service until it is modified to prevent an accident.

32.   If the braking device had been working, it might have prevented the accident, said the administrator, Jolene Molitoris.

33.   In December, OSHA, which is responsible for preventing such accidents, withdrew the chemical safety program from a list of regulations it was planning to modify.

34.   It may not save a recklessly driven car, but it can help prevent some accidents.

35.   It also runs a nationwide service that keeps track of underground pipes, to prevent accidents during construction.

36.   It utilizes techniques such as the containment of engine failures and crash-worthy structural and fuel system designs to prevent minor accidents from becoming major catastrophes.

37.   Miele also questioned Sunday whether a test for metal fatigue could have prevented the accident.

38.   Most childhood accidents can be prevented through legislation and changes in behavior and the environment in which children work and play, according to the coalition.

39.   Metzenbaum charged that the settlement does nothing to prevent future accidents.

40.   Ms. Baumer, the St. Louis controller, also said the system was helpful, but she, too, was uncertain whether it would have prevented the accident.