As transport companies believe there will be an increased focus on the climatic and environmental impacts from their transports there is a need for tools to calculate emissions from the transports. The Green freight research project tries to employ emission functions developed in Europe to create an emission inventory at company level. The key challenge is to document that the assumptions that the emission functions build on are not violated by Norwegian conditions. This paper looks at how detailed registration can be conducted to validate or invalidate the underlying assumptions. A large geo referenced dataset is being collected that contains both GPS and engine parameters. The standard OBD-II protocol which is present in all new cars in Europe is being used to harvest the engine parameters. A Hinton diagram, most commonly used for displaying a weight matrix in neural networks, is modified to graphically show speed and acceleration matrices. The collected data can be used to verify that the emission inventories build on realistic emission data.