$2$ Vertical Alignment

A parabolic vertical summit curve between two gradients has been designed in accordance with desirable minimum standards given in CD$109-$ Highway Link Design.

Approach gradient

Departure gradient

Summit level

$g_1=3\mathrm{.}0\%$

Chainage of the vertical intersection point

$g_2=-3\mathrm{.}2\%$

Design speed

$h_{\text{s}\text{u}\text{m}}=43\mathrm{.}1m$

$2513\mathrm{.}615m$

$120kph$

a$)$ What is the chainage and level at each end of the curve?

b$)$ Between what chainages is the level greater than $42m?$