Dr James Tate of the Institute for Transport Studies, University of Leeds and Andrew Bradshaw of Fore Consulting Ltd tell Traffic Technology International Magazine about the importance of detailed and accurate emissions modelling for testing scenarios, forecasting and helping focus efforts on the measures that will deliver the biggest reductions in emissions and improvements in air quality.
Fore Consulting and the Institute for Transport Studies have recently completed a UK DEFRA-funded project for Wakefield Council to model emissions in four Air Quality Management Areas (AQMAs) in
Wakefield District, where the EU standards for NO2 have been breached. As part of this work, Fore Consulting has developed Aimsun microsimulation traffic models for each of the AQMAs in order to predict realistic second-by-second trajectories for each vehicle passing through the study area during the day, including detailed information on vehicle speed, acceleration and deceleration.
These trajectories are combined with detailed information on the local vehicle fleet and used by ITS to determine second-by-second tail pipe emissions using the PHEM emissions model. Crucially, the method is based on realistic driving conditions and not laboratory tests – an important consideration in the light of the recent vehicle emissions scandal. This provides more accurate predictions of emissions, including those from the new generation of Euro VI vehicles.
Article in full: Change is in the air: the importance of accurate emissions modelling
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