Probable changes in the mix of materials used to manufacture automobiles were examined to determine if economic or technical problems in recycling could arise such that the 'abandoned automobile problem' would be resurrected. Future trends in materials composition of the automobile were quantified, and possible constraints related to material characteristics, availability, and price were examined. The automobile resource recovery industry was studied in terms of economic incentives for recycling and technical obstacles to recycling of deregistered automobiles. A macro-model of the economy, the EPA sponsored SEAS model, was used to study overall economic and environmental effects and to bring to light any secondary effects that might be important. This volume contains appendices covering the following subjects: (1) Future Material Composition in Automobiles; (2) Projections of Automobile Sales by Weight Class; (3) Automotive Use of Plastics and Recycling Possibilities; (4) Safety Aspects of Materials Substitution; (5) Energy Consequences.