Horizontal Allignment

Horizontal Alignment

(i) Minimum Radius
The following formula is used in determining the required. minimum
radius for the curves.
R = V2 / 127(e+f)



Where R = Minimum radius of curve in meters V = Design
speed, in km/hr
e = Maximum rate of superelevation
J- = Maximum allowable side friction factor.

Table 5-11 gives the minimum radius that are to be used in design. Flattercurves
should always be used wherever possible. There is no necessity to
provide any transition (spiral) curves.

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