The blue zone parking rules are certainly in effect. We just returned from 10 days in St. Martin. On our first visit to Marigot noticed lots of parking spaces around the market marked with blue lines. Thanks to this board we elected not to park there. Found the gravel lot further down the road packed. Finally found a space near the cemetery.

Then we came upon a local police officer busy issuing lots of tickets to cars parked in blue spaced with no blue tags. He told us the fine is 17 Euro. Marigot was making lots of money that day.

There is no signage to indicate what the blue markings mean. So unless a tourist has followed this development on this site (or maybe elsewhere) they are a prime target for the parking enforcement officer.