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GATE 2017 CE (CE2) – Question 22

Traffic Engineering and Transportation Planning · Traffic signs, signal design by Webster method, intersections and interchanges · 1 mark · Multiple choice

Roundabout safety and efficiency can be increased, respectively, by ______.

  1. increasing entry radius and increasing exit radius
  2. increasing entry radius and decreasing exit radius
  3. decreasing entry radius and increasing exit radius
  4. decreasing entry radius and decreasing exit radius

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Show answer and explanation

Correct answer: (C) decreasing entry radius and increasing exit radius

Explanation

A smaller entry radius slows entering vehicles and encourages yielding, improving safety. A larger exit radius lets vehicles leave with less curvature and clears the circulating roadway more readily, improving efficiency. Thus **decrease entry radius and increase exit radius, C**.