One thing I thought about was the almost perilous nature of loading ferries with cars full of people of unknown weight. They load these ferries so that weight is balanced on both sides of the boat. So car 1 pulls up in lane 1, car 2 pulls up in lane 2 and car 3 pulls up in lane 3 - all running parallel to each other. Until the boat is full.  What happens if they send 4 vehicles with 2 200 pound people in each into one lane? That's 1600 pounds on one side of the boat... is this shit going to tip over one day??