Two straight sections of freeway cross at a right angle. at the point of crossing, the east-west highway is at elevation 150 ft and has a constant +5.0% grade (upgrade in the east direction), and the north-south highway is at elevation 125 ft and has a constant -3.0% grade (downgrade in the north direction). design a 90-degree ramp that connects the northbound direction of travel to the eastbound direction of travel. design the ramp for the highest design speed (to the nearest 5 mi/h) with the constraint that the minimum allowable value of d is 8.0. assume that the pc of the horizontal curve is at station 15 + 00, and that the vertical curve pvis are at the pc and pt. give the stationing and elevations of the pvis, pvcs and pvts. you may find that drawing out the horizontal and vertical curves aids in your solution. make sure to define the pvi elevations.