"High Cost of Letting Go" (Short) AKA Don't Drive Angry
A Union Pacific traffic education short.
A reporter solved the mystery of why a brother and sister died in a fatal accident. But before he'd tell the audience or his boss the reporter detailed every step he took to figure out what happened.
A series of interviews revealed that the family had emotions. Emotions caused the dad to get a ticket, the girl to get her bike run over, and the brother to speed past a red light and into a deadly railroad yard.