The extended concept of road assessment allows multi-modal capacity utilisation and capacity management to meet quality targets of road traffic. It supports the identification of different scenarios indicating how transport demand can be accommodated adequately. In a situation of growing transport demand and limited funds for infrastructure improvement, the assessment of road design has to be reconsidered. Corridor capacity results from the capacity of all means of transport. In Austria the revision of the relevant standard is using two tracks to make transport more efficient in order to ensure adequate quality of road traffic. The model which is calibrated on the present situation has to be able to compute the effects of different measures of infrastructure extension and traffic management on the flows of passengers and goods on the road. This shows that even in a single-modal procedure, the change of the transport paradigm alone results in an extended demand for data, tools and expertise.