Question $1(3$ points$)$

A horizontal curve on a four$-$lane

highway $(12-$ft lanes$)$ has PC at

station $123+80$ and PT at station

$130+20.$ The central angle is $38$

degrees, the superelevation is

$12\%,$ and $23\mathrm{.}00ft$ is cleared $($for

sight distance$)$ from the inside

edge of the innermost lane.

Determine a maximum safe

speed $($assuming current design

standards$)$ to the nearest $5m\frac{i}{h}.$

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