In a fixed-time traffic signal, the yellow interval mainly warns road users that:
Correct answer: C. The signal is changing from green to red
- A. The intersection is closed to all traffic
- B. The pedestrian phase has permanently ended
- C. The signal is changing from green to red
- D. The road is changing from two-way to one-way operation
Explanation
The yellow interval provides a transition between the green and red indications and warns approaching drivers to stop if it is safe to do so. It does not indicate a permanent closure or a change in road direction.
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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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