The City-Wide Impacts of the Interactions between Shared Autonomous Vehicle-Based Mobility Services and the Public Transportation System

Round 1

Reviewer 1 Report

• A chart needs to be added to the introduction of the methodology of the paper so readers could understand it more easily and remember from where you have started while they're scrolling down the pages.
• In conclusion, it was concluded that " to achieve flexibility of bus operations when the supply of shared mobility is expanded, a real-time coordination system for bus lines and dispatches must be introduced, and integrated mobility services that provide optimal mobility services to users by linking PTs and other modes of transportation must be implemented simultaneously in the future". These suggestions are of practical importance, but they are not going to be delivered as presented in this way. I suggest contrasting these suggestions with what you have found or have not found in the literature review and see if they approve or not approve those previous findings
• Some recent publications could also be cited to strengthen the background: "Impacts of trip characteristics and weather condition on ride-sourcing network: Evidence from Uber and Lyft", "Shared Mobility in Post-COVID Era: New Challenges and Opportunities", and "On the determinants of Uber accessibility and its spatial distribution: Evidence from Uber in Philadelphia".
• Even though researchers have ineloquently asked readers to trust them with the data they had relied on for this research, the authors' concern about data sources revealing should not jeopardize a research's validity and reliability.

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

Page 1, Abstract: My suggestion is to mention in the abstract that the modal split ratio measured was based on trips generated within each city in South Korea.

Page 1, Section 1. Introduction: My suggestion is to include the most used definitions for the concepts of autonomous vehicles (AVs), shared autonomous vehicle (SAV) and demand-responsive transit (DRT). In addition, please include the necessary references. The reader is not always familiar with these concepts.

Page 2, line 54, “For cities that heavily rely on PT,…”: Please define at this point within your manuscript how do you define “cities that heavily rely on PT” (please provide data concerning modal split like the data presented in subsection 3.1. Analyzed Cities and Selection of Types for metropolitan cities in South Korea). I would suggest trying also to see the availability of various Public Transport modes in each city, not just modal split.

Page 3, subsection 2.2. City-wide Impact Analysis: Are there any studies which examine the impact in terms of sustainable development / sustainable urban mobility? My suggestion is to try to include additional text and references concerning the impact to “sustainable development / sustainable urban mobility”.

Page 4, Section 3. Methodology: Please include a Data Flow Chart (DFC) in the specific Section, with all your methodological steps. This will help the reader to obtain a clear overview of your work from the beginning of the manuscript.

Page 5, Table 1. Modal split ratios of metropolitan cities in South Korea: Please make sure that the sum of all percentages appear in the specific Table is equal to 100%. For example, the sum for the city of Busan and the city of Daegu is equal to 100.1%.

Page 5, Table 2. Classification of the types and modal split ratios of major cities in South Korea: Please make sure that the sum of all percentages appear in the specific Table is equal to 100%. For example, the sum for the city of Gwangju and the city of Incheon is equal to 99.9%.

Page 8, subsection 3.2.4. Demand/supply ratio change scenario: Please provide justification within your manuscript for the selection of the ratio of shared vehicle supply and traffic demand (10, 25, 50, 100).

Page 9, equations (1) and (2): Please provide the definitions for the terms used in these equations.

Page 10, subsection 3.3.2. Simulation network and settings: “This agent-based simulation is based on a simplified Sioux Falls network comprising 24 nodes and 79 links.”. Please refer within your manuscript to the advantages of using the specific test network in comparison to other available test networks for the purposes of your research.

Page 13, Section 4. Results: It is a very comprehensive Section. However, it is almost 15 pages with 18 Figures and 5 Tables. Please consider the idea to include part of the material included in Section 4 in an Appendix if it is possible.

Page 29, Section 5. Conclusions: My suggestion is addressing your policy recommendations to the respective stakeholders involved (e.g., local authorities, Public Transport Operators etc.).

Author Response

Please see the attachment

Author Response File: Author Response.pdf