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Estimation of fuel consumption and pollutant emissions for evaluating road traffic conditions is useful for environmental assessment in traffic design, operations and planning. This also forms the basis of operating cost modeling. Fuel consumption and emission (CO2, CO, HC, NOx) models with four levels of aggregation for traffic engineering and transport planning purposes were developed by the first author and his colleagues at the Australian Road Research Board in the 1980s. These models are based on vehicle power requirements, and the four-mode elemental (modal) and the more detailed instantaneous forms of the model are implemented in the SIDRA INTERSECTION and SIDRA TRIP software packages.

This paper describes the recent work on recalibration of light and heavy vehicle parameters used by this model using a large empirical database for a modern vehicle fleet. Implications of the change in …