If the stopping distance is 60 meters, what is the minimum stopping sight distance required for a two-lane, two-way highway_________________?
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Answer: B. 60m
Explanation
On a two-lane, two-way highway, the minimum stopping sight distance required is equal to the stopping distance. Each traffic lane operates independently, allowing vehicles in opposing directions to stop within their own stopping sight distance. No extra sight distance multiplier is necessary because opposing streams are separated physically by travel lanes. Stopping sight distance is the minimum sight distance visible to a driver to stop safely before hitting an obstacle. It comprises driver reaction distance plus braking distance calculated under anticipated operating speeds. Two-lane highways carry bidirectional traffic flows separated by centerline markings or painted divider lines.
A sight distance of 30m is too short and would fail to provide adequate braking clearance for vehicles. Doubling stopping distance is a requirement reserved for single-lane two-way roads with restricted visibility conditions. Multiplying stopping distance by three produces an excessive length associated with passing sight distance requirements.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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