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Automated toll collection (ATC) systems have been implemented successfully in the United States to collect tolls on bridges and at tunnels and turnpikes. A conceptual national automated road pricing system (NARPS) is described. NARPS consists of a nationwide application of an integrated and coordinated ATC system. Its primary purpose is to collect variable tolls on congested urban roads to improve traffic distribution and the overall efficiency of the highway system. The components of the proposed system are transponders, detectors, and processors used to automatically identify approaching vehicles at normal speed, calculate applicable tolls, and maintain local data bases of all tolls and vehicles to be processed remotely in a control center. A nationwide application of an integrated ATC system offers numerous significant advantages: cost savings, efficiency, traffic management, and a host of secondary applications that are not feasible with localized ATC systems. The management of the system is simplified by billing only drivers who exceed a threshold toll amount, thereby exempting the majority of drivers in rural and other areas.