Returning to the original question: In looking through my photos, I came across this photo taken in July, 2002 at the Meredith town docks. I believe there had been a recent article in the Meredith News that the selectmen had prohibited overnight docking.
The sign has two problems: First, there is no such time as 12AM. Since they mean midnight, the sign should say 12M. Secondly, if 3-hour docking is allowed from 8AM to midnight, that implies that there are no restrictions at other times.