How to Make an Endless Runner Move from track to track smoothly

Hi, I'm making my first game - endless runner 3D, but I can't figure out how to make that player change lanes smoothly. I also don't know how to make it work on the phone - the player switches to the track on w$$anonymous$$ch side of the screen I drag my finger - much like subwaysurfers. (3 tracks are planned in the game.) I would like to use a rigidbody, but I can also use a characteer controller. Thanks! (I may be typing with mistakes because I use a translator)