A major impediment to the widespread implementation of Intelligent Vehicle Highway Systems (IVHS) is the absence of communications standards, particularly for mobile applications. The Communications Committee of the Transportation Research Board (TRB) sponsored a Communications Workshop in June 1990 to address this problem. The Workshop was attended by representatives from all levels of government, consultants, universities and industry from the United States, Canada, Europe, and Japan. Working groups were established to address specific issues, including research requirements, international compatibility, commonality and interoperability, content and format, and processes for developing standards. Problem statements generated by the working groups formed the basis for recommended action.This paper presents a report on the workshop by the editors of TRB Transportation Research Circular “Recommendations for Establishing Intelligent Vehicle Highway Systems (IVHS) Communications Standards” to be published in the near future which contains a comprehensive record of the entire proceedings.