Problem # $1$

Design a horizontal curve with superelevation.

Given:

Design speed $=75mph$

$f=0\mathrm{.}08396$

Degree of curve $=2\mathrm{.}5$

$=30$

$2\%$ normal cross slope

Two$-$lane Highway $($one lane rotated$)-$ Category $1$ in Table $15-11($see handout or book$).$

$PC=20+00$

$($a$)$ Use both the methods of horizontal curve setting for setting out the curve.

$($b$)$ Find the superelevation transition $(\frac{2}{3}$ attainment in the tangent and $\frac{1}{3}$ in the curve$)$ stations where left lane begins transition, left lane crosses $0$ percent, right lane begins transition, lanes attain full superelevation and for the transitions out.

Find e for stations $18+00$ and $19+00.$

Find stations where e is $7\%.$

Present Tables for $($a$).$

Draw sketches as shown in the class example for $($b$).$