A barrier, in particular for infrastructures or constructions, preferably for separating lines of communication, such as railways, roads or the like, from the surrounding environment, the barrier comprising: longitudinally spaced uprights along the direction of extension of the barrier, which support corresponding panel means; the respective upright comprising corresponding flange means; means for connecting the panel means to the respective upright; in which the connecting means are designed to insert in a corresponding seat provided in the panel means and said connecting means have corresponding means (151, 151) for anchoring to the upright and a portion for inserting in the respective seat of the panel means; the barrier being characterized in that: the connecting means are designed to retain simultaneously a first and a second panel (13, 13) vertically superposed to each other; the connecting seat comprises a first seat provided at the upper end of the lower panel and a second seat at the lower end of the upper panel, in which the a first seat and second seat facing each other; the first seat and the second seat extends according to the main longitudinal direction of extension of the same lower panel and upper panel; the first seat and the second seat extends vertically for a stretch less than the longitudinal length of the same first seat and second seat; the insertion portion has a first engagement flange inside the respective connecting seat of the upper panel and a second engagement flange inside the connecting seat of the corresponding lower panel. longitudinally spaced uprights along the direction of extension of the barrier, which support corresponding panel means; the respective upright comprising corresponding flange means; means for connecting the panel means to the respective upright; in which the connecting means are designed to insert in a corresponding seat provided in the panel means and said connecting means have corresponding means (151, 151) for anchoring to the upright and a portion for inserting in the respective seat of the panel means; the barrier being characterized in that: the connecting means are designed to retain simultaneously a first and a second panel (13, 13) vertically superposed to each other; the connecting seat comprises a first seat provided at the upper end of the lower panel and a second seat at the lower end of the upper panel, in which the a first seat and second seat facing each other; the first seat and the second seat extends according to the main longitudinal direction of extension of the same lower panel and upper panel; the first seat and the second seat extends vertically for a stretch less than the longitudinal length of the same first seat and second seat; the insertion portion has a first engagement flange inside the respective connecting seat of the upper panel and a second engagement flange inside the connecting seat of the corresponding lower panel. the connecting means are designed to retain simultaneously a first and a second panel (13, 13) vertically superposed to each other; the connecting seat comprises a first seat provided at the upper end of the lower panel and a second seat at the lower end of the upper panel, in which the a first seat and second seat facing each other; the first seat and the second seat extends according to the main longitudinal direction of extension of the same lower panel and upper panel; the first seat and the second seat extends vertically for a stretch less than the longitudinal length of the same first seat and second seat; the insertion portion has a first engagement flange inside the respective connecting seat of the upper panel and a second engagement flange inside the connecting seat of the corresponding lower panel.