Extra widening is provided on a horizontal highway curve mainly because of:
Correct answer: B. Vehicle off-tracking and driver psychology
- A. Increased pavement drainage requirements
- B. Vehicle off-tracking and driver psychology
- C. Reduced strength of the road subgrade
- D. Greater thickness of the surface dressing
Explanation
The rear wheels of a vehicle follow a shorter radius than the front wheels, causing off-tracking on curves. Additional width also gives drivers greater clearance and psychological comfort while negotiating 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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