In a flexible pavement, the main structural function of the base course is to:
Correct answer: D. Distribute wheel loads over the subbase and subgrade
- A. Prevent all temperature changes in the surface layer
- B. Provide a waterproof seal over the wearing course
- C. Mark traffic lanes for night-time visibility
- D. Distribute wheel loads over the subbase and subgrade
Explanation
The base course is a major load-carrying layer that spreads traffic stresses before they reach weaker underlying layers. Waterproofing and marking are not its primary structural functions.
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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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