Module 3: Geometric design of highways

Lecture 15 Horizontal alignment II

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5.Calculate the ruling minimum and absolute minimum radius of horizontal curve of a NH in plain terrain. (Hint: $V_{ruling}$=100kmph, $V_{min}$=80kmph., e=0.07, f=0.15) [Ans: 360 and 230 m] 6.Find the extra widening for W=7m, R=250m, longest wheel base, l=7m, V=70kmph. (Hint: n=2) [Ans:0.662m] 7.Find the width of a pavement on a horizontal curve for a new NH on rolling terrain. Assume all data. (Hint: V=80kmph for rolling terrain, normal W=7.0m, n=2, l=6.0m, e=0.07, f=0.15). [Ans: $R_{ruling}$=230m, We=0.71, W at HC=7.71m]