I've applied Motion Tile to a square road texture so as to create a long endless road to nowhere. I've done this before; I simply keyframe the Tile Center parameter for the time I need the road running. This usually requires two keyframes of parameter number in the thousands.
As I've been learning more and more about Expressions, I figure there must be a way to simplify this. Since the road is 'up & down' I figured I need the 'time*' expression but only the 'Y' parameter. I referred to Dan Ebbert's MotionScript site and thought his "Wiggle One Dimension Only" could be applied in a modified form using the 'time*' expression. No go; at least not the way I tried it. Am I on the right path here?