A vehicle tends to skid outward on a horizontal curve even though the pavement surface is in good condition. Which geometric deficiency is the most likely cause?
Correct answer: C. Insufficient superelevation
- A. Insufficient shoulder width
- B. Excessive road camber
- C. Insufficient superelevation
- D. Excessive vertical gradient
Explanation
Insufficient superelevation leaves too much of the lateral demand to be resisted by tyre friction, increasing the risk of outward skidding. Shoulder width and vertical gradient do not directly provide the required centripetal force on the curve.
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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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