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**Length Of Transition Curve**

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

Length Of Transition Curve |

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**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 circular curve in m .

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

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

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

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

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

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

According to I.R.C standards, the length of horizontal transition curve should act ,than 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)