Cover letter Dear Editors and Reviewers from the Case Studies on Transport Policy journal My name is Vu Van-Huy, and I am from Vietnam. With a focused research background in transportation systems and a specific interest in improving urban mobility, I am eager to contribute my expertise in evaluating bus movement dynamics and their interactions with other road users. During my recent study, titled “Assessment of bus movement and their interactions with motorcyclists in mixed traffic condition: An expanded model”, I addressed critical gaps in analyzing bus driver behavior and their impact on motorcyclists using an innovative expanded model. The research leveraged advanced traffic surveillance data, specialized analytical software, and a robust methodological framework, incorporating eight unique indices to overcome traditional limitations. Conducted in Hanoi, this case study not only highlighted significant findings - such as the pronounced effects of bus lane changes on motorcyclists - but also demonstrated the practicality of employing the propensity score matching (PSM) method to assess bus-motorcycle interactions comprehensively. My expertise spans traffic data analysis, model development, and a deep understanding of public transportation systems, with a commitment to translating findings into actionable recommendations for policy and infrastructure improvements. Coupled with my experience in using tools like T-surveyor and PSM methodologies, I am confident in my ability to make meaningful contributions to your team’s objectives. I am excited about the prospect of collaborating with experts in the field to advance transportation research and enhance urban planning strategies. Therefore, I would like to submit my paper the the journal hope that you will consider it for publication. Thank you for considering my submission. Sincerely! Vu Van-Huy Mobile: (+84) 943-616-892; (+81) 90-481-9197 Email: huyvv@vnu.edu.vn