question archive PROBLEM 2 A crest vertical curve on a two-line highway coincides with a horizontal curve fitted with spirals The pavement is 26-ft witle with cross slope of 0
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PROBLEM 2 A crest vertical curve on a two-line highway coincides with a horizontal curve fitted with spirals The pavement is 26-ft witle with cross slope of 0.02 IV/It. The length of the vertical curve is 1.000-ft. Both ST and EVC are at station 150+ 45 and elevation 500.0) at the centerline as shown in the fixture below. EVC BA 150+45 ELEV-500/00 If the design speed of this roadway and the desired superelevation rate are 60 mph and 10% respectively, determine: 4.1 the length of the spiral. & 4.2 the length of the circular curve. & 43 the two stations fie., before SC and after CS) at which both the outside lane and iaaide lane slopes are equal to 5%, 4.4 the nation of the highest point on the curve, and 4.5 the elevation of the outside edge of the pavement at the highest point on the curve. 4.6 In this kind of coordination between the vertical and horizontal alignment desirable?