casing 3 to the bent distal end 16 of the beam 6 also in the embodiment of the present method system and device the two main walls 20 21 of the casing are metallic and act as radiating heating zones produced by the electric generator 2 thanks to electric resistor networks 28 fastened to the inner side 29 of the walls 20 and 21 such resistors are connected to the power supply of the vehicle 5 by a non shown wire 5 going through the beam 6 of the bearing structure 4 by means of a control command device 30 housed in the casing and ensuring amongst others the operation of the resistors the regulation of their temperature and the triggering of an alarm in the case of a malfunction thus the main walls 20 21 of the casing comprise the radiating surfaces of the decoy so as to emit an infrared radiation as well in the direction of the front left side as in the direction of the front right side of the vehicle for thereby triggering the sensors of the explosives before the vehicle drives by as some explosives have u201c smart u201d infrared sensors integrating signal processings over the temperature of the detected target vehicle each main wall 20 21 comprises two distinct heating zones 26 27 having different operating temperatures or temperature ranges thus in the example shown on fig5 a first low temperature zone could be provided representative of the temperature emitted by the engine of a vehicle and a second high temperature zone 27 representative of the temperature emitted by its exhaust line for.