Figure $-$ Road alignment

The traffic volume $($AADT$)$ at present is $750$ vehicles a day, of which about $30\%$ are heavy vehicles $($HVs$).$ The existing speed limit $=100k\frac{m}{h}.$ The existing lane width $=3\mathrm{.}1m,$ with no sealed shoulder.

The council decided to re$-$establish this segment with a new section having a design life of $20$ years and in that time the traffic volume will approximately double with about $25\%$ HVs$.$ The horizontal alignment of the road segment cannot be changed.

The existing curves have $3\%$ superelevation. In your new design, maintain the superelevation between $3\%$ to $7\%$ for each curve.

Use the 'desirable side friction values for cars' in your calculations.

Assume: $1HV=2$ passenger cars.

Estimate the following:

The maximum allowable safe speed on existing curve $1=,k\frac{m}{h}($Report answers to the nearest whole number, e$.$g$.87,$ without units$).$

The maximum allowable safe speed on existing curve $2=k\frac{m}{h}($Report answers to the nearest whole number, e$.$g$.76,$ without units$)$

Design suitable $\text{'}$e$\text{'}$ for curve $1=,\%$ and curve $2=,\%($Report answers to the nearest whole number, e$.$g$.5,$ without units$)$

Allowable speed limit on this new road segment $=k\frac{m}{h}($Round down your answer to the nearest five $(5)$ km$/$h$,$ eg$,75$ or $80$ or $85,$ without units

The tangent point chainage at TP$2=$

$($Report answers to the nearest three decipal place, e$.$g$.1324\mathrm{.}543,$ without units$)$

Determine suitable Pavement width $=m,$ Shoulder width$=m,$ and Minimum shoulder seal $=m($Report answers to the nearest one decipal place, e$.$g$.3\mathrm{.}2,$ without units$)$

Discuss the reasons for high occurrences of crashes