Horizontal drains represent an innovative techniques to mitigate the liquefaction of soil. As common vertical drains, they are able to dissipate exess pore pressures build-up during the seismic event. This innovative technique has been tested by means of true-scale trial-field, realised in Pieve di Cento (BG), measuring the evolution of the excess pore pressures in the sourraunding soil, during a shaking induced by a special machine. The field tests have proved a higth effectiveness in the excess pore pressures dissipation. Moreover, the horizontal drains can be applied under the existing structures, being highly appealing as a metigation action for urbanized areas