GATE CE 2026 Set 2 — Question 23
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Transportation Engineering → Cross-Section & Sight Distance → Stopping Sight Distance
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Question
An incident occurred on one side of a median on a four-lane dual carriageway road section. This incident disrupted the traffic movement in one direction. Traffic police diverted the traffic from disrupted side to the other side through an opening in a median. The desired sight distance on the four-lane dual carriageway was kept as m under normal conditions. The Stopping Sight Distance (SSD, in m), which should be available on the operating road section after the incident, is
Correct answer
(C) 180
Solution
On a dual carriageway (one-way traffic), the desired sight distance is typically the Intermediate Sight Distance (ISD) to allow for safe maneuvers.
Under normal conditions: .
Given m, we find m.
When traffic is diverted to the other side, the road section operates with two-way traffic. The minimum sight distance required for safe operation is the Stopping Sight Distance (SSD). Since SSD is a property of the design speed and reaction time, it remains m.
Under normal conditions: .
Given m, we find m.
When traffic is diverted to the other side, the road section operates with two-way traffic. The minimum sight distance required for safe operation is the Stopping Sight Distance (SSD). Since SSD is a property of the design speed and reaction time, it remains m.
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