While many states in the US allow riding without a helmet, with age and other restrictions, you do not see the passing on the left and other reckless antics often seen on the island. I often rode without a helmet (my choice as per OH law) locally but I always wore a helmet on a trip or if riding on the interstate but I NEVER rode like I often see on SXM. Virtually all laws that apply to vehicles apply to motorcycles in the states and are enforced as such. Such enforcement seems to be rather lax on the island to say the least.