remote controlled car ramps

I enjoy making ramps for my remote controlled car, as it is fun and a goooooooood use of my time. For my ramps I use books, boxes and blu-tack. This is a video that shows it in action:

See, if you have a remote control car and you want to make a ramp for it, I would say that the ramp has to be smooth, unless it has off road monster truck wheels like mine does.