Abstract:This paper considers the development of a method to assess the impacts of transport systems on the urban environment and for investigating plans to ameliorate adverse environmental impacts in a region. The method draws on models for transport network analysis and for fuel consumption and emissions modelling. Models permitting: (1) the examination of alternative policies and broad strategies for metropolitan travel, and (2) alternative vehicle and fuel technologies, are included in the system. The paper indicates how these procedures are being integrated into an environmental impact assessment package, or supermodel, known as IMPAECT (Impact Model for Prediction and Assessment of the Environmental Consequences of Traffic). IMPAECT consists of a set of four PC-based computer models linked through a common data structure. The component models are a traffic network model, a vehicle energy and emissions (air and noise) model, a pollutant dispersion model and a land use impact model. The modular design of the supermodel allows the use of alternative components, to suit local needs and thus enhance flexibility of use.

Note:Published in Urban Transport and the Environment for the 21st Century, ed. L.J. Sucharov.