A horizontal circular curve must be designed for a location with the following

properties:

Point of Intersection $($PI$)$: sta $347+50$

Central angle $($delta$)$: $57$ degrees

Design speed: $70mph$

Superelevation: $3\%$

Side friction coefficient: $0\mathrm{.}10$

Determine the curve radius.

Determine the station numbers for the Point of Curvature $($PC$)$ and the Point

of Tangency $($PT$)$ for the curve of problem $1.$ Use arc definition for degree of

curve.

Determine the superelevation runoff length if no spiral curve is provided.

Consider this to be a multilane highway. See Table $15\mathrm{.}12$ in the textbook

Garber and Hoel $4^{th}$ Edition.

Table $15\mathrm{.}12$ Superelevation Runoff $L_1(ft)$ for Horizontal Curves

Nowe: $(1)$ Two$-$lane $-122\%$ cross slope

$(2)$ Multilane $-12ft$ each direction rotated separately