When a qualified PrePass-enrolled commercial vehicle approaches an open weigh station, PrePass automatically verifies with state and federal authorities whether that vehicle is eligible to bypass. PrePass weigh station bypass software operates using either a radio frequency identification (RFID) transponder mounted to the truck windshield, or through the PrePass app, a mobile bypass app for use on cell phones, tablets and telematics systems. The system then delivers a red or green signal to the transponder / device in the vehicle’s cab. If the driver receives a red light, they are required to pull into the weigh station. If the driver receives a green light that means they have been pre-cleared to bypass the weigh station.