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Title:

Comparison of Support Vector and Non-Linear Regression Models for Estimating Large-Scale Vehicular Emissions, Incorporating Network-Wide Fundamental Diagram for Heterogeneous Vehicles

Accession Number:

01737648

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/issn/03611981

Abstract:

Estimation of vehicular emissions at network level is a prominent issue in transportation planning and management of urban areas. For large networks, macroscopic emission models are preferred because of their simplicity. However, these models do not consider traffic flow dynamics that significantly affect emissions production. This study proposes a network-level emission modeling framework based on the network-wide fundamental diagram (NFD), via integrating the NFD properties with an existing microscopic emission model. The NFD and microscopic emission models are estimated using microscopic and mesoscopic traffic simulation tools at different scales for various traffic compositions. The major contribution is to consider heterogeneous vehicle types with different emission generation rates in a network-level model. This framework is applied to the large-scale network of Chicago as well as its central business district. Non-linear and support vector regression models are developed using simulated trajectory data of 13 simulated scenarios. The results show a satisfactory calibration and successful validation with acceptable deviations from the underlying microscopic emissions model regardless of the simulation tool that is used to calibrate the network-level emissions model. The microscopic traffic simulation is appropriate for smaller networks, while mesoscopic traffic simulation is a proper means to calibrate models for larger networks. The proposed model is also used to demonstrate the relationship between macroscopic emissions and flow characteristics in the form of a network emissions diagram. The results of this study provide a tool for planners to analyze vehicular emissions in real time and find optimal policies to control the level of emissions in large cities.

Supplemental Notes:

© 2020 National Academy of Sciences: Transportation Research Board.

Language:

English

Authors:

Saedi, Ramin
Verma, Rajat
Zockaie, Ali
Ghamami, Mehrnaz
Gates, Timothy J

Pagination:

pp 70-84

Publication Date:

2020-5

Serial:

Transportation Research Record: Journal of the Transportation Research Board

Volume: 2674
Issue Number: 5
Publisher: Sage Publications, Incorporated
ISSN: 0361-1981
EISSN: 2169-4052
Serial URL: http://journals.sagepub.com/home/trr

Media Type:

Web

Features:

References (44)

Geographic Terms:

Chicago Metropolitan Area

Subject Areas:

Environment; Highways; Operations and Traffic Management

Files:

TRIS, TRB, ATRI

Created Date:

Apr 17 2020 3:04PM