Found a billboard candidate for you in Most Wanted MildObstruction. Do it in single player or jump into a private multiplayer room (I don't know if it makes any difference, I did it in multiplayer).
Start on the southern edge of the map and start driving east. At the South-Eastern edge of the map it will curve around and start going north. Halfway down this straight away will be a repair shop on the left, drive through and fill your boost, and keep going north. As soon as you drive under the overhead train bridge, make a left onto the dirt road and drive up to the train tracks. Drive 50 or so feet north between the train tracks then do a 180. Drive south between the train tracks toward the bridge, just before you reach the bridge on your right will be a board, gun your boost as you approach the bridge then turn and go through the board. That is one that had pretty low distance on it.