I was killing time on YouTube the other day, and came across a video of a shipping company moving a very long girder to a construction site. There were several points in the move that they had to block all traffic through an intersection (with one of the chase cars) for a few minutes in order for the truck to be able to swing around enough to make the turn.
Now, just to be clear, I wouldn't have a problem with this if I were in one of the cars that was inconvenienced for a minute. But I do want to know, is it, strictly speaking, legal? Is there something in their oversized vehicle permit (or whatever paperwork) that says "You can block the road"? Or is it simply a matter of practicality, where the police realize that they need to get the girder there somehow, and it would cost more time and money to ticket them for blocking the road than it would just to let them continue?