The length of the spiral curve is 260 ft with a degree of the central curve equal to 4°. Use g= 32.17 ft/s? a) Determine the desirable velocity of the car in miles per hour. b) Determine the maximum super-elevation of the curve at the third quarter-point of the spiral from S.C. if the road width is 10ft. c) Determine the length of the long tangent of the spiral.

6) A horizontal curve is to be designed on a 2-lane road on a mountainous terrain. The flowingdata are known: Δ= 40 deg, T = 436.76’, station of PI: 2700+10.65, fs = 0.12, and e = 0.08.Determine the following:a) design speedb) station of the PCc) station of the PTd) deflection angle to the first 100’ statione) chord length to the first 100’ station