On a sag vertical curve, which factor commonly controls the required curve length during night-time operation?
Correct answer: C. Headlight sight distance along the curve
- A. Driver reaction time on the approach
- B. Pavement thickness at the low point
- C. Headlight sight distance along the curve
- D. Width of the shoulder on the curve
Explanation
At night, the driver’s view on a sag curve is limited by the headlight beam and its upward angle. Therefore, headlight sight distance commonly controls the design of the sag curve. Pavement thickness and shoulder width do not directly control this visibility requirement.
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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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