A 34-year-old man survived a single-car rollover accident in Nelson, Calif., in May, extricating himself and walking away, but was struck and killed minutes later by an Amtrak train as he crossed railroad tracks.

In April in Houma, La., a 23-year-old motorist, having sideswiped a driver waiting to make a turn, drove away without stopping and was killed minutes later when he crashed into another car.

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