The invention relates to an automatic system for reducing the turning speed of a vehicle. The inventive system consists of a computer (3) comprising an integrated series of instructions for processing: (i) signals which are supplied by an operator (2) and which are representative of a forward movement set value and a steering set value, (ii) signals which are supplied for a forward movement actuator (8) and a steering actuator (9), (iii) signals which are supplied by a linear speed sensor (12) and by a yaw speed sensor (13), and (iv) signals which are supplied by a case (16) providing grip. All of the aforementioned signals are processed according to the kinematic laws governing the movement of the vehicle. The inventive method consists in measuring the forward speed V and the yaw speed ohm of the vehicle in order to control a first forward actuator (8) in terms of force or torque and a second steering actuator (9) of the vehicle using the computer in order to reduce the speed thereof according to the deviation between the working point desired by an operator (2) and the working point supplied by the computer.