I can’t figure out how to start a roadtrip after you win the championship on xbox 360. im probably being dumb but i cant find it anywhere… help?
It’s just the character telling you it’s now up to you to explore the world at your leisure. You make up your own road trips by going where you like. There is no more structured progression and you can play the game how you choose.
Hope that helps 
The actual pad trip feature (drive to one place with a bunch of AI and get XP) is not present in the X360 version of the game.