Use the left and right arrows to move the car thing this goes infinitely (Yes, really!) to the right but not to the left. Click green flag again after changing jaggedness or steepness
The changes I made: the terrain is mostly smoother now, but doesn't feel predictable, at least in my opinion. You can still make the terrain slightly jagged while staying close to the curves, to make it look like a rough dirt path. You can also adjust the steepness. Fun variable values you can set: -100 jaggedness and 1 steepness for something similar to the original project. -50 jaggedness and 0 steepness for a flat dirt path -0 jaggedness and 0 steepness for the flattest road known to man -0 jaggedness and 100 steepness for amplified generation -100 jaggedness and 100 steepness for chaos