Guides
Longer pieces on the rules behind the calculators: where the numbers come from, and the situations where they break.
Your truck is under 40 tonnes and still illegalThe total tells you nothing about the split. Spanish limits are not the European ones, and the driving axle has a minimum as well as a maximum.The NMFC changed in July 2025. Here is what actually movedOnly freight over 35 lb/ft³ changed class on the density scale. The expensive part of the reform is somewhere else entirely.