The National Roadway Traffic Noise Exposure Model (NRTNEM) is comprised of a collection of on-line datasets, some containing programs and others containing data. The manual describes the job submission procedures required to run the NRTNEM as it existed on the NCC (EPA's National Computer Center) in December, 1981, under user ID EPADYN. The NRTNEM actually consists of two models: The General Adverse Response Model ('GAR'), and the Single Event Model ('SEM'). Only one of them can be executed by a job at a time. The Programmer's Manual describes the NRTNEM system in more detail to facilitate program maintenance. The NRTNEM was designed for and runs on an IBM/370 computer under MVS, with TSO (the Time Sharing Option) and WYLBUR, the latter two being conversational direct-access systems.