Where is extra widening typically applied on mountain roads______________?
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Answer: B. fully on the inner side of the curve
Explanation
Extra widening on mountain roads is applied fully on the inner side to maintain proper lane positioning for drivers. Centrifugal force and off-tracking cause rear wheels to shift inward on sharp horizontal curves requiring additional pavement width. Placing the widening entirely on the inner side preserves the outer road edge stability on steep mountain terrain. Horizontal curves on mountain roads require both mechanical widening for off-tracking and psychological widening for driver comfort. Off-tracking occurs because rear wheels follow a shorter turning radius than front wheels when vehicles negotiate tight curves. Retaining wall construction on mountain curves makes inner-side widening much more economically and structurally feasible.
Option A suggests splitting widening equally, which would unnecessarily complicate outer edge earthwork and guardrail placement. Option C proposes placing widening fully on the outer side, destabilizing steep embankments and valley-side slopes. Option D divides widening into fractional proportions, which contradicts standard highway engineering practices for mountain curves.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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