Proximity tags for vehicles

An object tracking system comprising:

• a wireless device coupled to a vehicle, the wireless device including
• a first antenna,
• a first transceiver electrically coupled to the first antenna, and
• a sensor coupled to the first transceiver and configured to monitor a parameter of the vehicle, the parameter related to an operational state of the vehicle;
• and
• a mobile communication device including
• a second antenna,
• a second transceiver electrically coupled to the second antenna to communicate with the wireless device, and
• a processor coupled to the second transceiver, the processor operable to
• generate a first list of objects that are located within a communication range of the second transceiver when the vehicle is in a first operational state,
• generate a second list of objects that are located within the communication range of the second transceiver when the vehicle is in a second operational state, and
• compare the second list of objects to the first list of objects.