How to handle tracks in a backfacing 2d runner game?

I am looking to make a 2D back-facing runner game similar to Danger Dash.

I understand how to approach most of the game but the one thing I am confused on how to approach is the generating the track the player runs on and making it curve up, down left and right. From what I can tell, its something similar to how old racing games like pole position handle their tracks but I don't think that is the right approach.

Any advice on this would be greatly appreciated.