Hello. I'm going to be building a ramp for my grandmother so she can drive her jazzy from her driveway to her porch. My issue is when the ramp slopes down and meets her blacktop, one side is approximately 5"-6" lower than the other side. Is there a practical way to transition this spot? My thought was to stop my ramp one board away from the blacktop and angle the last board to meet. I have a feeling though that smarter minds have already come up with a better solution. Any advice would be greatly appreciated!! Thanks. Mike.