A negative 5% grade meets a positive 3% grade at vertexelevation 146.24m directly under an overpass bridge whose undersideis at elevation 152.74 and carries another road across the gradesat right angles.What is the longest parabolic curve that can beused to connect the two grades and at the same time provide atleast 5 meter clearance under the bridge at its center line? If theunderside of the bridge is level and is 12 meter wide, Find theactual clearance at the left and right of the bridge. Draw thediagram.
