This area has been purpose built for bikes (pedal type). To the left of this area is the concrete ramps for bikes and skateboard riders to practice and display their skills.
The area in the photo has a concrete ramp with cover to the right and can be used to start races over the humps as see above. I wasn't in time to get a photo of some people using this area as when they finished the circuit, they rode off.
It would take a lot of skill to ride as fast as you can to win the race, but also not to go so fast as to fall off your bike if you can't control it. This is only a small portion of the track and continues back and forth down lower.