Endless Runner forcing player to follow height and direction changes

In my endless runner I want to have direction changes and elevation changes randomly, I can spawn the track fine, but how are some ways I can make sure the player follows these? And also curve around a corner instead of hard 90 degree turns.

The only thing I can think of is to set up a trigger box, and while the player is in the trigger box they move up,down,etc. But in that case im not sure how it would curve rather than move in a straight line.

Picture attached to show what I mean.