Question

The PVI of a vertical curve is at station 110 + 00 and elevation 1100.00 ft. The vertical curve is equal tangent, 600ft long, and connects an initial grade of +1.30% and a final grade of –1.10%. The vertical curve crosses a 3ft diameter pipe at right angles. The pipe is located at station 112 + 00 and its centerline is at elevation 1093.00 ft.

a) Using offsets, determine the depth, below the surface of the curve, to the top of the pipe;

b) For a car with low ground clearance, collision with any object higher than 0.5ft may cause damage to the vehicle. For this type of car, what is the safe driving speed on this curve?

Answer 1