[EN] The objective of this study is to obtain and determine the characteristics of the ground through which the current layout passes, as well as the alternatives proposed in order to improve it in the A-1515 road section studied. In addition, this study aims to calculate the dimensions of the structures¿ foundations, as well as the stability of the slopes generated in the new paths while providing the information required by the rest of the team involved in this assessment, in order to elaborate their assignments. The ground studied is formed by several geological units. It is possible to find information about these units in sheets 591 and 614 developed by the IGME. This information has been verified after the field visit where soil samples were collected to study in the laboratory in order to characterize the ground. The information has then been completed with bibliography to fully characterize the materials. All relevant checks and studies have been carried out. Firstly, a study of the geological risks in the area affected by the layout has been carried out. Seismic, flood and instability risks of slopes have been studied. A verification of the road¿s location in the Seismic Hazard Map, aloud the determination of the seismic acceleration, being this one 0.4 time the gravity¿s acceleration. The information obtained for the hydrology annex determined the existence of flood risk in the areas where the foundations of the alternative 1 structure stand. Stability slopes tests have been carried out. First towards sliding for which Slide Software has been used, concluding that the gradient of all the slopes will be 3/1 (vertical / horizontal); and then towards landslides for which program Rocfall has been used, determining the need to place a mesh on some of the slopes. Finally, sinking, overturning, sliding and slump tests have been carried out, being the slumps the most restrictive criteria, and therefore, the one determining the footings' dimensions. ; [CA] '¿objectiu d'aquest estudi es conèixer les ...