As a qualified PrePass-enrolled vehicle approaches an open weigh station, PrePass automatically verifies whether or not that vehicle is eligible to bypass. PrePass operates using either a radio frequency identification (RFID) transponder mounted to the truck windshield, or through PrePass MOTION, a mobile app for use on tablets. The system then delivers a red, green or no light signal to the transponder / tablet in the vehicle’s cab. Based on that signal, the driver knows whether or not to pull into the station. Green means bypass and red or no signal means pull in.