A traffic signal controller that changes green time in response to detected traffic demand is called a:
Correct answer: C. Actuated controller
- A. Manual priority controller
- B. Fixed-time controller
- C. Actuated controller
- D. Flashing warning controller
Explanation
An actuated controller receives information from detectors and adjusts the signal timing according to traffic demand. A fixed-time controller operates according to preset intervals regardless of current arrivals.
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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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