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The entrance and exit curves of a rotary have
  • a)
    equal radii and equal widths of pavement
  • b)
    equal radii but pavement width is more at entrance than at exit curve
  • c)
    equal pavement widths but radius is more at entrance curve than at exist curve
  • d)
    different radii and different width of pavement
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
The entrance and exit curves of a rotary havea)equal radii and equal w...
Vehicles leaving the rotary would accelerate to the speed of the radiating roads and hence the exit curves should be of larger radii than entry curves. Hence the pavement width at entrance curve will be higher than at exit curve as the radius of the former is less than the latter.
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Most Upvoted Answer
The entrance and exit curves of a rotary havea)equal radii and equal w...
Explanation:

A rotary is a circular intersection where traffic moves in a counterclockwise direction around the center island. The entrance and exit curves of a rotary are important components of the design that affect the safety and efficiency of the intersection. Let us see why option D is the correct answer.

Different Radii:

The radius of a curve is the distance from the center of the circle to the point where the curve starts. In a rotary, the entrance and exit curves may have different radii depending on the design and location of the intersection. If the entrance and exit curves have different radii, it can create problems for drivers who may not be able to maintain a consistent speed or direction while navigating the rotary. This can increase the risk of accidents and make the intersection less efficient.

Different Width of Pavement:

The width of pavement refers to the amount of space available for vehicles to travel on the road. In a rotary, the width of pavement may vary depending on the design and location of the intersection. If the pavement width is different at the entrance and exit curves, it can create problems for drivers who may not be able to maintain a consistent speed or direction while navigating the rotary. This can increase the risk of accidents and make the intersection less efficient.

Conclusion:

Therefore, the correct answer is option D, different radii and different width of pavement. A rotary with different radii and different pavement width can create problems for drivers and make the intersection less efficient. A well-designed rotary should have equal radii and equal width of pavement at the entrance and exit curves to ensure the safety and efficiency of the intersection.
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