HBEFA (The Handbook Emission Factors for Road Transport) is a model for estimation of fuel consumption and exhaust emissions. Distribution of the total annual vehicle mileage on weight classes and vehicle types, such as heavy lorries with and without trailers, has a large effect on estimated emissions in HBEFA. However, there is no reliable data to divide the foreign lorry annual vehicle on Swedish roads into different vehicle types and weight classes (segments). So far, it has been assumed that the foreign annual vehicle mileage is distributed in the same way as the Swedish vehicle mileage regarding different weight classes, and if the lorry is running with or without a trailer. One possible source to get more reliable data, is Eurostat’s transport data register, but these data are not available at vehicle level due to confidentiality.