PrePass is an automatic vehicle identification (AVI) system that enables participating transponder-equipped commercial vehicles to be pre-screened throughout the nation at designated weigh stations, port-of-entry facilities and agricultural interdiction facilities. Cleared vehicles are then able to "bypass" the facility while traveling at highway speed, eliminating the need to stop. Vehicles participating in the PrePass program are pre-certified. Customers’ safety records and credentials are routinely verified with state & federal agencies to ensure adherence to the safety and bypass criteria established by PrePass and member states. If an approaching PrePass-equipped vehicle’s weight and credentials are found to be satisfactory, a green light and audible signal from the windshield mounted PrePass transponder advise the driver to bypass the weigh station. Otherwise a red light and audible signal advise the driver to pull into the weigh station for regular processing. Vehicles bypassing inspection facilities save drivers and their companies valuable time on the road, thereby reducing fuel and operating costs, while increasing productivity (See "Calculating Your Savings"). PrePass also benefits member states and everyone who uses our nation’s highways. By reducing congestion around inspection facilities and enabling state inspection staff to focus their efforts on carriers that demand the most attention, PrePass helps make the roadways safer for everyone.