Now that makes sense! Thanks!
When working at the national lab we learned about all about rigs and Equivalent Single Axle Loads when my group developed a fiber-optic weigh-in-motion sensor. Different highways are designed to withstand the passage of different numbers of ESALs before degrading. There is a whole lot more to road construction than I imagined.
https://www.pavementinteractive.org/...gle-axle-load/
We were told overweight trucks operated to bypass the weigh stations were a huge problem in some areas.
I spent a lot of time along the side of interstates with trucks whizzing by. Some drivers tried to bounce their rigs to catch and tear up our test scales (some apparently HATED the idea of any kind of weight enforcement), and traveling all over taking data and video, visiting weigh stations, and collaborating with partners. Good clean fun!
Maybe some day they will tax the big rigs more appropriately and leave us with little diesel farm trucks and cars alone. I buy ag diesel without out tax for the tractor and such but apparently it's expensive to get caught with it in a road vehicle! (It has dye I'm told detectable even in trace amounts.)
JKJ