The objective of this four-volume study is to formulate a basis for the design of a joint interagency action program which would simultaneously improve urban mobility and air quality and conserve petroleum resources. This second volume presents an algorithm for calculating the impacts on transportation energy use and pollutant emissions of alternative urban transportation mixes. The algorithm is used to compare the change in national urban energy use and pollutant emissions implied by the maximum conceivable diversion of 1990 urban auto travel to bus, rail and para-transit compared to the no-diversion case. This exercise is supported by appendices showing the derivation of the methodology and of the database. The volume also includes a discussion of issues, tradeoffs, and methodologies relevant to the local determination of a balanced modal mix in an individual metropolitan area.


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