TRACTOR-TRAILER AND METHOD FOR CONTROLLING THE SPEED OF ADVANCE OF THE TRACTOR-TRAILER

A tractor-trailer comprising a tractor unit (2) and at least a semitrailer (3) and a control unit (18) configured to receive at least one data item (31) indicating a condition of adherence of the tractor unit (2) to the ground;the control unit (18) comprises a processing unit (18a) configured to receive and process the data items (D1; D2; D3) detected by a plurality of sensors (14; 15; 16) and to determine, on the basis of the data items (D1; D2; D3), a relative indication of the load of the semitrailer (3);the processing unit (18a) is configured to establish a reference speed of forward movement on the basis at least of the indication of the processed load of the semitrailer (3), of a data item indicating an ambient condition of the ground on which the tractor unit (2) advances and of data item (D4) indicating the steering angle.