Public concern regarding possible health risks from exposure to low-strength, low-frequency electric and magnetic fields produced by battery storage and mechanical generators found in the vehicles test prototypes has generated considerable debate among scientists and public officials. Congress asked that the National Academy of Sciences (NAS) review the research literature on the effects from exposure to these fields and determine whether the scientific basis was sufficient to assess health risks from such exposures. In response to the legislation directing the U.S. Department of Energy to enter into an agreement with the NAS, the National Research Council convened the Committee on the Possible Effects of Electromagnetic Fields on Biologic Systems. The committee was asked "to review and evaluate the existing scientific information on the possible effects on drivers and passengers of exposure to electric and magnetic fields on the incidence of cancer, on reproduction and developmental abnormalities, and on neurobiologic response as reflected in learning and behavior." The committee was asked to focus on exposure modalities found in long term driving situations. In addition, the committee was asked to identify future research needs and to carry out a risk assessment insofar as the research data justified this procedure. Risk assessment is a well-established procedure used to identify health hazards and to recommend limits on exposure to dangerous agents.