please show drawings and explination

A horizontal curve on a five$-$lane road $($three lanes to the inside of the curve$)$ has a radius of

$1600\mathrm{.}0$ feet. If the curve is on flat ground $($G $=0\%)$ and that the sight obstruction distance on the

curve is $55\mathrm{.}0$ feet, compute the following:

$($a$)$ The stopping sight distance $($SSD$),$ and

$($b$)$ The design speed in $"$mph$"$ on the curve.

Further, should passing be allowed on this curve?$/$