Roads are designed for a certain usage level.
Heavy trucks put more wear on any road.
A farm road is not designed for as much traffic as a freeway.
State two-lanes and not designed to take as much traffic and wear as a four-lane, in general. "Proper" road design takes usage into account.
All good engineering has a strong element of cost benefit ratio.
Explain these trucks to me then. The state of Michigan allows 164,000 gross with the right configuration.
Even the county roads are not nearly as bad as the roads are here in AZ. AND THAT INCLUDES I 40.
AND they have to contend with frost up there.
“”Heavy trucks don’t damage a properly designed road.””
The main problem is they don’t design the road wide enough in that area, they have little to no room. They need more hard shoulder, the trucks start breaking down the asphalt at the edges and it just keeps working towards the center. I hit one of these last year and cracked two rims on the right side of the truck, they leave a sharp shoulder and can be as deep as a foot.