Hi, everybody, and thanks for the answers.
Djaydino:
Should I add FSM to the checkpoints? Or should I do all the logic on the Start/Finish trigger?
I did what tcmeric explained with 3 checkpoints, and it works. But the problem as djaydino said, if I drive backwards, then it will be problems. If I cross the finish line in the wrong direction, it will register a lap.