standby state and the communication state the emitted energy varies according to a ratio of several hundreds to several thousands when a communication is detected the local wireless communication detector lwcd 110 sends to the information recorder ir unit 120 a signal u201c communication on u201d by applying a predefined voltage on the line connecting the lwcd unit 110 to the information recorder unit ir 120 the u201c communication on u201d signal is maintained as long as the wireless communication is detected when the communication is terminated a u201c communication off u201d signal is generated in a preferred embodiment the u201c communication off u201d signal corresponds to a null voltage indicating an absence of communication the information recorder ir unit 120 includes a recorder device 121 similar to the recording systems u201c spying black boxes u201d systems currently used for trucks the messages received from the vehicle information collector unit vic 100 are recorded when the u201c communication on u201d signal is received from the local wireless telephone communication detector unit lwcd unit 110 and or as long as the u201c communication on u201d signal is received from the local wireless telephone communication detector unit lwcd unit 110 preferably at regular time intervals and or on the occurrence of a particular event for instance when the vehicle 39 s speed exceeds a particular speed limit the method for recording physical information when wireless communications take place from a moving vehicle is summarized in flowchart 200 shown in fig2 this method used in the information recording ir unit comprises the following steps at step 201 the method is in its.