Geometric Design. You are asked to fit a horizontal (circular) curve between two tangent sec- lions of highway. The “incoming” section runs in a northeast direction (compass reading 45 degrees) and the “outgoing” section runs directly east (90 degrees on the compass). The PC and PT are 361 feet apart (straight-line distance). What will be the length of the horizontal curve (to nearest 0.1 feet)? Regardless of your calculations in part a, assume the curve has a radius of 566 feet. If the design speed is proposed to be 60 mph, demonstrate whether an appropriate superelevation value can be found to ensure a safe curve.
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