This report provides the specification for a transport and emissions model for West London. The model will generate detailed information on traffic movements and emissions across the whole of the West London area, and on air quality at specific locations. It will also address the problems associated with combining transport modelling approaches which are designed for application on different spatial scales. Transport modelling requirements and capabilities are defined in terms of emissions and air quality parameters, rather than in terms of infrastructure or traffic management parameters. Finally, the model will have a scenario modelling capability.
The report considers the various types of traffic and emission model which are currently available for use in West London, and the parameters used in the various models are subjected to an initial comparison in order to identify potential links and conflicts. Some basic emission modelling requirements are described in the report - in particular, specific sources and pollutants. The sources which are covered are ‘hot’ exhaust emissions, cold-start exhaust emissions, evaporative emissions and non-exhaust emissions of particulate matter.
At this stage in the project the main recommended modelling approach involves the combination of an area-wide traffic model such as SATURN and emission functions from the National Atmospheric Emissions Inventory and the European 5th Framework project ARTEMIS. For detailed local assessments there is a recommendation to use an ‘instantaneous’ emission model such as PHEM in conjunction with a microsimulation traffic model such as VISSIM. For sources other than hot exhaust emissions, the additional input parameters required for the respective models are not generally available from traffic models, and the input data will have to be derived from other sources. The second phase of the work will concentrate on the actual production of modules and tools for traffic and emissions modelling.

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