Q$\mathrm{.}3.($a$)$ Compare between local and collector roads. Include all factors of comparison.

$(10$ marks$)$

$($b$)$ The figure below illustrates the vertical alignment on a low$-$volume $2-$way $2-$lane,

rural minor arterial. Determine if the critical length of grade is exceeded.

All dimensions of vertical curves $($VC$)$ and tangents are in meters.

$(15$ marks$)$