IRC recommends Spiral or clothoid as the ideal transition curve due to following reasons:

1. It satisfies that rate of change of centrifugal acceleration is constant i.e., L_{s}.R = constant. Where L_{s} = length of transition curve R = radius of curve.

2. The calculation and field implementation of spiral curve is simple and easy.

Why not cubical parabola and what is clothoid spiral?

Rani said:
(May 4, 2016)

What is meant by clothoid spiral?

Abhiraj said:
(Aug 22, 2016)

What is clothoid spiral?

Kamal Karki said:
(Oct 8, 2016)

Clothing spiral means?

Karan Kumar said:
(Oct 26, 2016)

The equation of ideal transition curve usually called as CLOTHOID spiral or GLOVER spiral or EULER spiral.

Chetan Surpam said:
(Nov 17, 2016)

It's a wrong answer.

The right answer should be lemniscate curve. But it is not given in the option.

Amit Ami Sharma said:
(Dec 15, 2016)

IRC recommends Spiral or clothoid as the ideal transition curve due to following reasons.

1. It satisfies that rate of change of centrifugal acceleration is constant i.e., Ls.R = constant. Where Ls = length of transition curve R = radius of the curve.

2. The calculation and field implementation of the spiral curve is simple and easy.

3. It enhances aesthetics also.

Abdulrasith said:
(Feb 16, 2017)

Clothing spiral means?

Explain in clear.

Taba said:
(Mar 27, 2017)

Explain Clothing spiral.

Please anyone describe in detail.

Nayan Ahir said:
(Dec 15, 2017)

Ideal shape of transition curve=clothoid spiral or true spiral.

And curve recommend by IRC is cubic spiral.

Avinash said:
(Jan 16, 2018)

The correct answer is cubic spiral and clothoid.

Manojkumar said:
(Apr 26, 2018)

Cubic parabola is the correct answer.

Yogesh Rajput said:
(Jun 1, 2018)

The correct answer is clothoid spiral. I agree.

Bidyut said:
(Jun 22, 2019)

What is clothoid spiral?

Jeet said:
(Feb 26, 2020)

A. Cubic parabola - Railway.
B. Cubic spiral - Road.
C. Clothoid spiral - Ideal.

Nagendra Yadav said:
(Aug 15, 2020)

Curves fulfilling equation of an ideal transition curve are known as "Clothoids or true spirals".

Assumi said:
(Oct 14, 2020)

For Highway - Lemniscate is best.

For Railway - Cubic parabola and cubic spiral is recommended.

Pankaj Kumar said:
(Nov 25, 2021)

Radius and centrifugal acceleration are change gradually and setting out of curve easy, jerk problem can be prevented in spiral/clothoid transition curve.

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