Civil Engineering - GATE Exam Questions - Discussion

Circular curve is the right answer.

Many curve forms can be used with satisfactory results, the common practice has been to use parabolic curves in summit curves. This is primarily because of the ease with it can be laid out as well as allowing a comfortable transition from one gradient to another. Although a circular curve offers equal sight distance at every point on the curve, for very small deviation angles a circular curve and parabolic curves are almost congruent. Furthermore, the use of parabolic curves were found to give excellent riding comfort.

Many curve forms can be used with satisfactory results, the common practice has been to use parabolic curves in summit curves. This is primarily because of the ease with it can be laid out as well as allowing a comfortable transition from one gradient to another. Although a circular curve offers equal sight distance at every point on the curve, for very small deviation angles a circular curve and parabolic curves are almost congruent. Furthermore, the use of parabolic curves were found to give excellent riding comfort.

The circular curve is correct. Because ideal shape is circle, provided shape-parabola. It is the correct one.

Ideal shape for Summit curve is Circular because side distance is constant.

An Ideal shape is circular.

Ideal shape is circular because it gives sight distance constant throughout tge length of the circular curve. But considering the good riding comfort, in practice simple parabolic curve is used as summit curve.

The Answer is C.

Because the question is about ideal shape not about good comfort or what is the shape of summit curve in actual practice.

In actual practice, the shape is preferred as simple parabolic (real life) instead of circular so as to provide good riding comfort.

Circle is the right answer.

Circular curve is the right answer because of uniform sight distance.