High Capacity Transports (HCT) on road has been proven to increase transport efficiency considerably and decrease the environmental impact of goods transports. Several projects within the HCT research and innovation program led by Closer have shown that heavier and longer vehicle combinations, compared to today’s maximum allowance of 25,25 m and 64 tons, can decrease CO2 and other emissions from truck transports. One example is the test of the DUO-trailer combination which is a 32 m long tractor with two semi-trailers connected with a dolly. The maximum gross combination weight (GCW) allowed in the test is 80 ton. The average GCW is 60 ton and the average load per trailer is 15 tons. By transporting more goods in a HCT vehicle combination, the transport efficiency, measured in L/ton.km, is improved by 27% compared to a tractor and semitrailer combination of 16,5 m, and by 16% for a tractor with a link and semi-trailer of 25,25 m. To evaluate the effects of an implementation of HCT on road, a number of different aspects should be considered. Transport efficiency and environmental performance, as mentioned above, are the most obvious aspects have described the following aspects as the main ones to consider for HCT transports. - Transport efficiency (l/ton.km) - Transport productivity (or cost efficiency of the transports) – Safety - Efficient use of the road infrastructure - Wear of roads - Environmental impact. Ideally, the above listed aspects should be positively influenced by an implementation of HCT. A report by Conlogic AB states that “In general it seems that the single most significant driver for front runners to strive for a more energy efficient and climate smart transport system is cost advantages”. Thus, it is critical that the transport efficiency and environmental benefits of HCT is also matched with transport productivity gains for the transport operators. In addition, it is necessary to ensure that there are no negative impacts on safety and infrastructure.