Detectors can be placed at two or more locations to match up unique Mac IDs and detection times to determine the travel times of the vehicles with the Bluetooth device. The units are battery powered and all data is stored on removable storage cards. The battery life was observed to be approximately eight days and could be recharged in approximately four hours. The units were turned off and removed from their site locations while recharging. For installation, the Blufax units were simply locked to trailers (see Figure 1). Raw Blufax data was recorded with lists of all recorded Mac IDs and detection times. Blustats analysis software was used to post-process the raw Blufax data and generate travel times between locations.