One of my friends asked me to build a pair of ramps for his children to use with their bikes. I made one with a gentle curve for the take-off and the second was a flatter ramp for landing. They can be moved further apart as confidence grows and actually after these pics were taken I screwed on a 3 foot length of 2×3 timber to make them more stable. I also gave them a good sanding to prevent splinters.

back view of ramps