Module 3: Geometric design of highways

Lecture 18 Vertical alignment II

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Problems

1. A valley curve is formed by descending gradient $n_1$= 1 in 25 and ascending gradient $n_2$= 1 in 30. Design the length of the valley curve for $V$=80kmph. (Hint: c=0.6 m/cm$^3$, SSD=127.3m) [Ans: L=max(73.1,199.5)]