European countries has been working in the last ten years in the implementation of high capacity vehicles in road networks. The EU allowed each member state to use combinations of cargo carriers with a modular concept, the European Modular System (EMS). This paper analyses the real behavior in road test of the Euro Modular vehicle of 70 tons of maximum load, so-called Duotrailer. A route in real conditions is used and comparisons between different typologies of vehicle (Trailer, Gigatrailer and Duotrailer) in terms of fuel consumption and emissions are performed. Results in the route tested show that, as expected, the highest consumption correspond to Duotrailers. However, savings with regard to trailers are around 22 % (per ton) and 26 % (per ton and m3), and savings with regard to Gigatrailers are around 9 % (per ton) and 23 % (per ton and m3) considering that the load factor is higher in Duotrailers. Although emissions are higher in Duotrailers, the load capacity is higher.