I was on the Casco Bay Lines ferry from Portland(ME) to Peaks Island, about a 15 minute trip. Peaks Island is part of Portland. However, there have been numerous attempts in the last several years by which Peaks would secede from Portland and become a municipality unto itself. Said actions have, thus far, failed to occur. Though there are year-round residents, probably the bulk of properties are owned by out-of-staters whose families have been summering on the island for generations.(See photo of vehicle whose allegiance is license-plated).
The numerous ferries of CBL run every hour, they being the sole transportation to the work or school locations of the island residents. Many passengers travel with their cars/trucks because work or school may be somewhat distant from in-city Portland.
If "Junior" doesn't get his accompanying vehicle to the ferry "in-time" for the last run he'll be stuck on the mainland. The ship and truck in my photo belong to a contractor. Thus, it's not a traditional ferry, but a ship the contractor uses to transport his construction vehicles to/from the Casco Bay Islands(Peaks, Cliff, Long, Great Diamond, and others. It's just very unusual to see a tied to a mooring vessel with a vehicle on it. So I captured the occasion.
It's possible that the island's restriction on overnight parking of construction vehicles ran counter to the contractor's skipper not getting the truck back to the mainland, and offloaded, prior to the ferry terminal's nightly shut-down time. Don't know, but the fact that it's sittin' on the bay was unusual.
HR
[EDIT] Added photo shows part of the north side of the large island. It is ringed with similar properties as well as along the roads throughout the interior. One house is a former bunker from WW-II, where the gun placements(US Army 240th Coast Artillery) used to be on the lookout for German submarines.