On the main highway you'll know you've passed crosed over by a stone monument commemorating the partition and signs reading Bienvenue Partie Francaise in one direction, Welcome to Sint Maarten'' in the other that's all.
There are border checkpoints when you attempt to cross.  
mnli hypothesis: There are border checkpoints when you attempt to cross.   premise: On the main highway you'll know you've passed crosed over by a stone monument commemorating the partition and signs reading Bienvenue Partie Francaise in one direction, Welcome to Sint Maarten'' in the other that's all.