Joy wrote:
I have always wondered about the truck scales on the sides of major
highways. I would like to understand how they work.

Does a truck have to report to the scales once a trip or every time it
passes the scales? Once they find out how heavy the truck is, do
they have to pay fees based on the load? What is the reasoning?? Is
it some kind of user pay or is it a way to help moving vans measure
the weight of their load? Any explanations would be appreciated!

What I find interesting is they have to go through the scales even if the
commercial vehicle is not pulling a load at the time, or if the trailer is
obviously empty (like a flat bed)?