Both sides of the island follow European driving regulations; for Dutch Sint Maarten, these rules have been modified. Compared to the US, less of traffic is regulated by signage, because general rules cover more. As an example: Cars coming from the right have the ‘right of way’. The only exception is traffic signs indicating otherwise. If there are no traffic signs, as the driver you must assume that traffic from the right will not stop for you. Be very careful not to just assume that you are on a major road and that cars coming out of smaller alleys have to wait.
Drivers on both sides of the island are usually very courteous and will show a high level of tolerance to visitors who are unfamiliar with local roads and driving habits.