System, tire and method for determination of the behavior of a moving tire

System for the continuous determination of the interaction between a tire (1) and the ground during the movement of a motor vehicle, said said system tire (1) and processing means (8), said tire (1) comprising a housing (2), a tread (3), belt plies (6), sidewalls (4), beads (5) and at least a first sensor (7; 307; 407; 507; 607; 707; 807) associated for operation with said processing means (8), characterized in that said first sensor (7; 307; 407; 507; 607; 707; 807) comprises an elongate piezoelectric element (10; 12; 20; 210 ) whose length is at least twice greater than its width and extending along a first portion of said tire (1) for supplying a first electrical signal that is generated by rotation of said tire (1) and form cyclically on each revolution of the tire (1), said first electrical signal elements dist intivos due to nonuniformities of said tire (1) and said processing means (8) being capable of acquiring said first electrical signal and detecting variations in said distinctive elements of said first electrical signal to continuously determine the interaction between said tire (1) and ground during said movement of said motor vehicle.