Q$1.$ A horizontal curve is designed for a two$-$lane road in a level terrain. The following data are known:

Central angle $(A)$:$50$ degrees

Design speed of $80k\frac{m}{h}$

Side friction factor $=0\mathrm{.}12$

Superelevation $=0\mathrm{.}08$

Lane width $=3\mathrm{.}60m$

Normal crown slope $=2\%$

Draw $3$ neat and well labelled sketches of the roadway cross sections overlaying the normal

crown on the fully superelevated section; as discussed in class, for the following $3$ scenarios:

a$)$ Rotation about the road centreline

b$)$ Rotation about the inside edge of pavement

c$)$ Rotation about the outside edge of pavement

Discuss the impact of each method of rotation on drainage and amount of earthwork.