Tunnel detection system and method for a motor vehicle

A tunnel detection system for a motor vehicle comprising:

• a radiofrequency signal receiver that receives a radiofrequency signal coming from a source external to the vehicle;
• a controller communicating with the radiofrequency signal receiver, the controller configured to detect at least one amplitude variation in the radiofrequency signal received by the receiver;
• at least one sensor for sensing at least one weather condition;
• the controller is configured to determine at least one correspondence level representative of the difference between the detected amplitude variation in the radiofrequency signal and at least one predetermined reference signal amplitude variation representative of the amplitude variation in a signal received by the receiver when the receiver travels into a tunnel;
• the controller is configured to compare the determined correspondence level with a predetermined minimum correspondence threshold;
• the controller is configured to detect the tunnel being travelled through by the detection system when the determined correspondence level is greater than or equal to the predetermined minimum correspondence threshold;
• the controller is configured to detect at least one weather condition variation;
• the controller is configured to adjust the predetermined minimum correspondence threshold in accordance with the detected weather condition variation.