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They made a video that explains how to navigate the roundabout, and shows what it will actually look like (with yield markings)[1]

[1]: https://youtu.be/07_m7HHiZRw

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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.

1: https://titanww.com/what-is-a-pup-trailer/

2: https://imgur.com/raDJVVL

3: https://www.youtube.com/watch?v=mU5L_2TMjKc (sorry, terrible handheld video)

I guess that's exaggerated to proof that it works?

Um, if your new traffic feature requires an explanatory video, then you've done something wrong...

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