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We wish to express our sincere gratitude to Tsinghua University Press for covering the open access charges for our authors, and Elsevier to provide publishing service for the journal. Together with them, the editorial team will endeavor to develop a forward-looking journal with impact beyond the transport community.
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).