The road and the load are checked together, not separately
The road is planned around the height, length, width and weight of the combination you are actually running. Then every leg of that road is checked against the freight aboard for that leg.
Why this is different
Truck navigation stops at the road. It has no idea how your weight sits across the axles, so it will happily route you onto a corridor where you fail the scale. Today those are two questions, answered by two people, usually on the phone.
The truck leaves the yard at 61,000 lb gross with the drives at 31,400 lb, and every road on the plan is truck-legal. At stop two it picks up 14,000 lb of steel, loaded forward of the tandems, and the drives read 35,100 lb — 1,100 lb over — for the whole leg to stop three. The road was legal the entire time. The load was not.

