ANSWER PART D

$1.$ For a tangent section of road being designed for RAU$90$ classification, a vertical curve that is the minimum length to provide passing sight distance is planned to transition from a $+1\mathrm{.}6\%$ grade to a $-0\mathrm{.}8\%$ grade. The VPI Station is $325+00$ and its elevation is $84\mathrm{.}30$ m$.$ The section will have a curb and gutter drainage system with a normal crown cross$-$slope of $2\%,$ four lanes each $3\mathrm{.}5$ m wide, and no shoulders.

a$)$ Determine the length of the vertical curve that provides minimum passing sight distance with MTO Guidelines $($Slide $10$ values$).$

b$)$ Between which stations would the absolute value of the grade be at or below $0\mathrm{.}3\%,$ which is the minimum grade required for longitudinal drainage?

c$)$ Determine the difference in centre line elevations between the stations determined in part b$)?$

d$)$ Repeat Parts a$)$ and b$)$ for a vertical curve that provides minimum stopping sight distance with MTO Guidelines and provide a discussion, in one or two lines, comparing the two sets of results $($for minimum passing and minimum stopping sight distance$).$