Mt. Hood Meadows wants to add a welcome sign to the new highway to let drivers know they are near the entrance to the resort. The sign will be placed over an equal tangent sag curve, directly over the PVI. The sag curve has an initial grade of -2.2% and a final grade of +5.0%. The PVC is at station 14+10 and the PVT is at station 23+90. (a) What is the minimum height Engineer Ali can place the welcome sign above the street for SSD requirements? (b) Does the minimum height satisfy AASHTO minimum clearance height recommendations?