3TI has developed a remarkable experience in the road field, working since many years both in the public and private sector for important clients carrying out prestigious projects in and outside Italy. The group committed in the road infrastructure design deals with all aspects linked to it including the design of viaducts, tunnels, underground channels, pedestrian areas, road surfaces, signposting and lighting with the aim to reduce traffic congestion and minimize the environmental impact. The road infrastructure is once again the object of an integrated design. It is important to point out how the majority of the design aspects gain a remarkable relevance in terms of security: some, as for example the road axis geometry, determine the degree of “intrinsic” security of the infrastructure, while others, such as the adoption of specific construction details, can contribute to enhance the level of security or at least to substantially reduce the seriousness and consequences of accidents in case they occur. To obtain such results, the design stage starts from the evaluation of the user behavioural dynamics. The road project, that is the plano-altimetric geometry, the cross-section, the boundary conditions and the intersections are certainly the major conditioning elements for the driver of a vehicle. However, to significantly reduce the accidentalness, the user needs to adopt his/her behaviour to the road characteristics and the latter has to intervene positively in this process favouring the adaptation. To guarantee the design quality, from all road users safety point of view, the design group will submit the selected planning solutions to the Road Safety Audit procedure. According to this procedure the road will be included within the Infrastructure-User system.