When two companies give different figures for the same shipment, the gap usually comes from the boundary, not from the fuel factor. ISO 14083 therefore standardises the rules: which operations are included, how emissions are allocated to the load and what the report shows. The GLEC Framework reduces the same method to steps a logistics operator can apply.
The standard requires empty trips, out-of-route distance, idling and auxiliary engines to be counted, and refrigerant leakage to be written into the emissions. In refrigerated transport that means the fuel and gas of the cooling unit appear as a separate line in the calculation.
Five items per trip are a sufficient start:
- Trip distance, including the empty return and detours.
- Load quantity and its unit.
- Fuel or electricity use, with the cooling unit shown separately.
- Empty return share.
- The number of customers the shipment is split across.
The source of the data is written into the report as well. ISO 14083 asks first for primary data from measurement; if it is missing, modelled data follows, then default factors by vehicle class, with the reason reported. If the method version, boundary and assumptions are kept in the same report, the same route can be compared fairly across periods and between carrier quotes.
