Design your race ! Draw the path with a curve, chose the number and type of the sections and parameter them whatever you want.
There are 6 types of sections :
Departure
Simple road
Obstacles
Ramp
Springboard
Looping
This project was made with Julien Cabezas. He used the HDA on Unity to make a playable game. The HDA generates the hit-box and a low poly version.