##
**Length Of Transition Curve**

**I**

**n**this article, I will show you how to design the length of the transition curve, or say how to calculate or determine the length of the transition curve.

Length Of Transition Curve |

###
**1.****The Rate of Change of Centrifugal Acceleration**

**The rate of change of centrifugal acceleration**to be developed gradually. From this consideration the length transition curve is given by the following equation:

Ls = 0.0215 V³/ CR

Where, Ls = Length of transition curve in m, V = Speed of vehicle in Km/h, C = Rate of change of centrifugal acceleration, R = Radius of the circular curve in m.

**The minimum and maximum values of C are limited to 0.5 & 0.8 respectively.**

###
**2.****The Rate of Introduction of Designed Super Elevation **

**The rate of introduction of designed superelevation**to be at a reasonable rate. From this consideration the length of the transition curve is given by the following :

Ls = e.N (W + We)/2

Where, e = The rate of designed superelevation, W = Normal pavement width in m, We = Extra widening pavement at the circular curve in m. 1/N = Rate of change of superelevation (Minimum value of N is 150 to 60 ).

###
**3.****By Empirical Formula**

According to I.R.C standards, the length of the horizontal transition curve should act, then the value given by the following equations:a)For plain and rolling terrain, Ls = 2.7 V²/R

b)For mountainous and steep terrain, Ls = V²/R

**.....Read more-**(Length of Valley Curve, Length of summit Curve)