Plant for the production and distribution of bituminous conglomerates comprising: - at least one dryer for drying materials to be treated wherein the at least one dryer is provided with a burner generating drying heat for the materials to be treated by means of at least one flame of the burner, obtaining treated materials; - a first suction system of hot air from said at least one dryer; - a mixer for mixing at least the treated materials; - a control unit; wherein the plant is adapted and intended for the treatment of the materials to be treated including inert lithic materials and materials containing bitumen, bituminous conglomerates or recycled bituminous material or mixed materials containing at least one part of materials containing bitumen, in which the at least one dryer is made up of at least one first dryer portion and of a second dryer portion (4") which are arranged one after the other with the interposition of a hot air passage compartment between the first dryer portion and the second dryer portion (4"), in which the material advances within the first dryer portion according to a direction of advancement of the material in the first dryer portion and in which the material advances within the second dryer portion (4") according to a direction of advancement of the material in the second dryer portion (4"), and further in which the first dryer portion is provided with said burner generating drying heat for the materials present within the first dryer portion and wherein said first suction system of hot air sucks hot air from said at least one dryer with the establishment of a hot airflow oriented from the first dryer portion provided with the burner towards the second dryer portion (4") in which the at least one dryer comprises adjustable deviation means (32, 33) for the deviation or for the adjustment of the quantity of said hot airflow oriented from the first dryer portion provided with the burner towards the second dryer portion (4") characterized in that the first dryer portion is divided into two zones of which a first zone constitutes a first chamber or combustion chamber in which the flame of the burner develops and of which a second zone constitutes a second chamber or drying chamber within which said materials are present, the first dryer portion being provided with a passage integral with the first dryer portion itself, the passage putting in communication the combustion chamber of the first dryer portion with the second dryer portion (4") generating a preferential path for a high temperature gas flow for heating the material of the second dryer portion (4"), the first dryer portion being thus intended to constitute: - a supply conduit of the hot airflow produced by the burner towards the second dryer portion (4") in a condition in which materials to be treated are not present inside the first dryer portion; or - the portion for the treatment of the materials to be treated inside the first dryer portion in a condition in which materials to be treated are not present inside the second dryer portion (4"); or - both a supply conduit of the hot airflow produced by the burner towards the second dryer portion (4") and the portion for the treatment of the materials to be treated inside the first dryer portion in a condition in which materials to be treated are present both inside the first dryer portion and the second dryer portion (4"). - at least one dryer for drying materials to be treated wherein the at least one dryer is provided with a burner generating drying heat for the materials to be treated by means of at least one flame of the burner, obtaining treated materials; - a first suction system of hot air from said at least one dryer; - a mixer for mixing at least the treated materials; - a control unit; - a supply conduit of the hot airflow produced by the burner towards the second dryer portion (4") in a condition in which materials to be treated are not present inside the first dryer portion; or - the portion for the treatment of the materials to be treated inside the first dryer portion in a condition in which materials to be treated are not present inside the second dryer portion (4"); or - both a supply conduit of the hot airflow produced by the burner towards the second dryer portion (4") and the portion for the treatment of the materials to be treated inside the first dryer portion in a condition in which materials to be treated are present both inside the first dryer portion and the second dryer portion (4").