The all-red interval in a traffic signal is provided primarily to allow:
Correct answer: A. Vehicles in the intersection to clear it
- A. Vehicles in the intersection to clear it
- B. Pedestrians to begin crossing early
- C. Additional vehicles to join the queue
- D. The signal controller to change its cycle
Explanation
During the all-red interval, all approaches display red so vehicles already within the intersection can leave safely. It reduces the chance of conflict between the ending and beginning movements.
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About Transportation Engineering
Transportation engineering covers highway planning and alignment, traffic studies, road geometric design, pavement materials and flexible or rigid pavement construction. It also includes railway, airport and traffic engineering concepts such as sight distance, superelevation, signals, capacity and level of service, distinguishing pavement failure from poor geometric design.
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