Proof of Parallels

My brother recently had surgery and will be restricted to a wheelchair for the next six weeks. Because of this, we need wheelchair ramps on our steps so he has access to the house. The wheels on a wheelchair are parallel, so the ramps must be parallel or the wheelchair cannot successfully scale the ramps. I can prove that the wheels are parallel, and that the ramps are close enough to parallel to allow the wheelchair to travel up and down them.

Because of the angle at which the pictures were taken, the ramps appear slightly crooked, but I can assure you that they are not. If you zoom out, you can see this.

(~CB1)