I'm surprised that so many people never heard of these. They aren't unique to Switzerland either. I got one for cars in Croatia, main connection between two cities across the Sava, the nearest bridges are either going across the border in Slovenia od 20km around via highway. They are considering a bridge now in 2021 but nothing more than planing at this stage. Hundreds of vehicles and thousands of people per day cross via one of these (albeit larger, firts four cars).