On a highway curve, the maximum permissible superelevation is limited mainly to prevent:
Correct answer: D. Excessive lateral movement or overturning of slow vehicles
- A. Reduction in runway visibility
- B. Loss of concrete strength at joints
- C. Increase in railway gauge
- D. Excessive lateral movement or overturning of slow vehicles
Explanation
Excessive superelevation can cause slow-moving vehicles to slide inward or become unstable when they travel below the design speed. Therefore, highway standards place an upper limit on the cross slope.
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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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