Title
Improved road traffic emission inventories by adding mean speed distributions
Author
Smit, R.
Poelman, M.
Schrijver, J.
TNO Bouw en Ondergrond
Publication year
2008
Abstract
Does consideration of average speed distributions on roads-as compared to single mean speed-lead to different results in emission modelling of large road networks? To address this question, a post-processing method is developed to predict mean speed distributions using available traffic data from a dynamic macroscopic traffic model (Indy) that was run for an actual test network (Amsterdam). Two emission models are compared: a continuous (COPERT IV) and a discrete model (VERSIT+macro). Computations show that total network emissions of CO, HC, NOx, PM10 and CO2 are generally (but not always) increased after application of the mean speed distribution method up to +9%, and even up to +24% at sub-network level (urban, rural, motorway). Conventional computation methods thus appear to produce biased results (underestimation). The magnitude and direction of the effect is a function of emission model (type), shape of the composite emission factor curve and change in the joint distribution of (sub)-network VKT (vehicle kilometres travelled) and speed. Differences between the two emission models in predicted total network emissions are generally larger, which indicates that other issues (e.g., emission model validation, model choice) are more relevant. © 2007 Elsevier Ltd. All rights reserved.
Subject
Traffic
Accuracy
Emission inventory
Emission model
Road network
Road traffic
Speed variability
Computational methods
Emission control
Mathematical models
Speed control
Road networks
Speed distributions
Speed variability
Traffic emission inventories
Traffic control
carbon dioxide
nitrogen oxide
comparative study
emission inventory
modeling
numerical method
road transport
traffic emission
velocity
air pollution
article
exhaust gas
particulate matter
priority journal
rural area
traffic
urban area
velocity
Amsterdam [North Holland]
Benelux
Eurasia
Europe
Netherlands
North Holland
Western Europe
To reference this document use:
http://resolver.tudelft.nl/uuid:6c46fbaa-61db-4b4d-bbba-dda2e2a1f68d
TNO identifier
240629
ISSN
1352-2310
Source
Atmospheric Environment, 42 (6), 916-926
Document type
article