I scrolled past this without second thought. Paused. Thought, wait, I've never seen a crane on the road. Scrolled back up. No answers. Typed this response, then noticed the book's author. What a whirlwind

Basically they bring it in piece by piece and assemble it on-site, using a smaller mobile crane (trucks with crane attachments) and once the crane itself is assembled, the top part can use hydraulics to climb up and down its own mast, so it builds itself taller like this

There is however no explanation for BJ Nomnom