boucharda--I would be interested in the answer to your question also. It does appear that either the Dutch side does not have specific rules about mask wearing in restaurants by servers, etc., or they are not followed, as so many other rules are not. On the other hand it seems that the French side is requiring social distancing and masks, etc., or at least they were, as of a Daily Herald story I saw maybe a week ago, about gendarmes doing enforcement actions.