The GATE Grind

GATE 2026 CE (CE2) – Question 23

Transportation Infrastructure · Geometric design of roadways: cross-section, sight distance, alignments · 1 mark · Multiple choice

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 360 m under normal conditions. The Stopping Sight Distance (SSD, in m), which should be available on the operating road section after the incident, is

  1. 360
  2. 240
  3. 180
  4. 720

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Show answer and explanation

Correct answer: (D) 720

Explanation

After the diversion the open carriageway carries traffic in both directions with no median between them, so it works like an undivided two-way road. There the sight distance must let two vehicles approaching each other stop short of a head-on collision, which needs twice the one-way SSD. With the normal sight distance of 360 m the available distance must be 2 x 360 = 720 m.