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Examines the usefulness of the red-light cameras that are placed at intersections and can take a picture of a car that runs a red light. Belief that the reduction in side collisions has been equaled by an increase in rear-end collisions as drivers try to stop late to avoid a ticket; Critics who charge that the revenue-sharing arrangements with the providers of the technology has resulted in the placement of the cameras not where they would promote safety, but where they can make the most money; Malfunctions and legal challenges which have led some cities to remove them while others are adding them; How they work; Comments from the leading provider, Affiliated Computer Services, on upcoming technology; Arguments for and against the system.