$($a$)$Determine the minimum length for a crest vertical curve for an urban arterial

street where the design speed is $45$ mph$,$ the initial grade is $+3\%$ and the

terminal grade is $-1\%.$ Use the AASHTO driver eye and object height

recommendations and $1\mathrm{.}0$ sec PIJR time.

$($b$)$ Use the urban arterial street from part A to determine the location and elevation of the PVC

and PVT if the PVI station is $755+20\mathrm{.}50,$ and its elevation is $525\mathrm{.}08$ feet