What the hell is that "dump truck with trailer" on a really long connector at 3:50? Is that a thing in some parts? How does that navigate almost any kind of roadway safely?
They're called "pup" trailers [1] (example photo [2]), and the very long hitch exists for a few reasons: per-axle weight limit, respecting max weight capacity of smaller bridges, and ease of unloading [3] among them.
