Peer Review History
| Original SubmissionJuly 24, 2025 |
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Dear Dr. Jiang, Thank you for submitting your manuscript to PLOS ONE. After careful consideration, we feel that it has merit but does not fully meet PLOS ONE’s publication criteria as it currently stands. Therefore, we invite you to submit a revised version of the manuscript that addresses the points raised during the review process. Please submit your revised manuscript by Sep 22 2025 11:59PM. If you will need more time than this to complete your revisions, please reply to this message or contact the journal office at plosone@plos.org . When you're ready to submit your revision, log on to https://www.editorialmanager.com/pone/ and select the 'Submissions Needing Revision' folder to locate your manuscript file.
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Thank you for stating the following financial disclosure: “This work has received funding from the China National Natural Science Foundation (No 71771183) and China National Natural Science Foundation (No 71901166). The data was collected in Jinan–Qingdao Highway in Shandong Province, China” Please state what role the funders took in the study. If the funders had no role, please state: "The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript." If this statement is not correct you must amend it as needed. Please include this amended Role of Funder statement in your cover letter; we will change the online submission form on your behalf. 7. Thank you for stating the following in the Acknowledgments Section of your manuscript: “This work has received funding from the China National Natural Science Foundation (No 71771183) and China National Natural Science Foundation (No 71901166). The data was collected in Jinan–Qingdao Highway in Shandong Province, China” We note that you have provided funding information that is not currently declared in your Funding Statement. However, funding information should not appear in the Acknowledgments section or other areas of your manuscript. We will only publish funding information present in the Funding Statement section of the online submission form. Please remove any funding-related text from the manuscript and let us know how you would like to update your Funding Statement. Currently, your Funding Statement reads as follows: “The author(s) received no specific funding for this work” Please include your amended statements within your cover letter; we will change the online submission form on your behalf. 8. In the online submission form, you indicated that your data is available only on request from a third party. 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Please ensure that you refer to Figure 16 and 18 in your text as, if accepted, production will need this reference to link the reader to the figure. 12. If the reviewer comments include a recommendation to cite specific previously published works, please review and evaluate these publications to determine whether they are relevant and should be cited. There is no requirement to cite these works unless the editor has indicated otherwise. [Note: HTML markup is below. Please do not edit.] Reviewers' comments: Reviewer's Responses to Questions Comments to the Author 1. Is the manuscript technically sound, and do the data support the conclusions? Reviewer #1: Yes Reviewer #2: Partly ********** 2. Has the statistical analysis been performed appropriately and rigorously? -->?> Reviewer #1: Yes Reviewer #2: N/A ********** 3. Have the authors made all data underlying the findings in their manuscript fully available??> The PLOS Data policy Reviewer #1: Yes Reviewer #2: Yes ********** 4. Is the manuscript presented in an intelligible fashion and written in standard English??> Reviewer #1: Yes Reviewer #2: No ********** Reviewer #1: The topic is interesting and consistent with the scope of the journal. The authors propose some kind of "generalization" of surrogate measures of safety computation, switching from the Cartesian coordinate system to the Frenet. The latter is well-suited for both straight and curved road segments, whereas the former, as correctly pointed out by the authors, has several shortcomings when dealing with curved segments. The paper provides a fresh point-of-view to the computation of surrogate measures of safety, which is welcome; unfortunately, I believe that the paper could be improved with some additional tests. 1) Line 189, please better motivate the choice of 0.5 s. 2) Lines 352-361. Please clarify if your centerline reference is the painted road centerline (i.e., you are assuming that the painted lines correspond to the actual midpoint axis of the road, which may be questionable). If so, there seems to be a non-negligible deviation from the spline and the painted centerline at certain points (Figure 13), how does this affect your results? Can you add some remarks on this? 3) Lines 397-402. The core of your work is to compare conflicts detected using the "traditional" and the "new" methods. Selecting the threshold to identify conflicts is a crucial operation that could significantly impact the results. Here, however, the TTC threshold is chosen in a rather arbitrary way. The authors could explore more of the literature to justify it, or to test several different thresholds. 4)Figure 15, it could be better to split it into two graphs, one for the rear-end and one for the lane-change. 5) How to verify the superiority of the proposed method by comparing it to the traditional approach? 6) Some literature suggests updating to the latest literature. Reviewer #2: 1. TTC is commonly used in the field of traffic safety to represent Time to Collision. Modify the Time to Conflict or its abbreviation in this article to avoid confusion. In addition, please unify the expression of “lane hanging” and “lane change” in the manuscript. 2. The current language standard in the manuscript falls below the journal's requirements. There are numerous grammatical errors and logical gaps between paragraphs. Professional editing is recommended. In addition, there are many confusing expressions that are difficult to understand, such as “It is necessary to wait until the accident Analysis can only be vehicleried out after the occurrence, which is ex post facto” in Line 39-40. Also, The numbering (e.g. (1) 1) ①) in this paper is confusing, please unify. 3. The literature review lacks comprehensiveness, particularly regarding studies on traffic conflict identification at curved roads. Furthermore, more recent references should be included. 4. Why choose the Frenet coordination system and what are its typical advantages compared to the Cartesian coordination system? 5. It is suggested to supplement the overall architecture diagram of the proposed method in “1 Method”, presenting the technical framework and logical structure systematically to enhance the clarity of the discussion. 6. Some symbols in the formula are not explained, which increases the difficulty of reading. In Figures 6-7, vehicle labeling and subscript capitalization are inconsistent. 7. In “2 Data”, the data processing part is too lengthy, it is recommended to simplify it. The result analysis part mainly compares the identification performance of the proposed method and the traditional method. How to obtain actual traffic conflicts based on the real data, and how accurate are the above methods compared to the actual conflicts? 8. The contributions of this article are not clear both in the introduction and conclusion sections. 9. Some paragraphs are too long and not easy to read. ********** what does this mean? ). If published, this will include your full peer review and any attached files. If you choose “no”, your identity will remain anonymous but your review may still be made public. Do you want your identity to be public for this peer review? For information about this choice, including consent withdrawal, please see our Privacy Policy Reviewer #1: No Reviewer #2: No ********** [NOTE: If reviewer comments were submitted as an attachment file, they will be attached to this email and accessible via the submission site. Please log into your account, locate the manuscript record, and check for the action link "View Attachments". If this link does not appear, there are no attachment files.] While revising your submission, please upload your figure files to the Preflight Analysis and Conversion Engine (PACE) digital diagnostic tool, https://pacev2.apexcovantage.com/ . PACE helps ensure that figures meet PLOS requirements. To use PACE, you must first register as a user. Registration is free. Then, login and navigate to the UPLOAD tab, where you will find detailed instructions on how to use the tool. If you encounter any issues or have any questions when using PACE, please email PLOS at figures@plos.org . Please note that Supporting Information files do not need this step. |
| Revision 1 |
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Dear Dr. JIang, Please submit your revised manuscript by Feb 19 2026 11:59PM. If you will need more time than this to complete your revisions, please reply to this message or contact the journal office at plosone@plos.org . When you're ready to submit your revision, log on to https://www.editorialmanager.com/pone/ and select the 'Submissions Needing Revision' folder to locate your manuscript file.
If you would like to make changes to your financial disclosure, please include your updated statement in your cover letter. Guidelines for resubmitting your figure files are available below the reviewer comments at the end of this letter. If applicable, we recommend that you deposit your laboratory protocols in protocols.io to enhance the reproducibility of your results. Protocols.io assigns your protocol its own identifier (DOI) so that it can be cited independently in the future. For instructions see: https://journals.plos.org/plosone/s/submission-guidelines#loc-laboratory-protocols . Additionally, PLOS ONE offers an option for publishing peer-reviewed Lab Protocol articles, which describe protocols hosted on protocols.io. Read more information on sharing protocols at https://plos.org/protocols?utm_medium=editorial-email&utm_source=authorletters&utm_campaign=protocols . We look forward to receiving your revised manuscript. Kind regards, Gen Li Academic Editor PLOS One Journal Requirements: If the reviewer comments include a recommendation to cite specific previously published works, please review and evaluate these publications to determine whether they are relevant and should be cited. There is no requirement to cite these works unless the editor has indicated otherwise. [Note: HTML markup is below. Please do not edit.] Reviewers' comments: Reviewer's Responses to Questions Comments to the Author Reviewer #1: All comments have been addressed Reviewer #3: (No Response) ********** 2. Is the manuscript technically sound, and do the data support the conclusions??> Reviewer #1: Yes Reviewer #3: Yes ********** 3. Has the statistical analysis been performed appropriately and rigorously? -->?> Reviewer #1: Yes Reviewer #3: Yes ********** 4. Have the authors made all data underlying the findings in their manuscript fully available??> The PLOS Data policy Reviewer #1: Yes Reviewer #3: (No Response) ********** 5. Is the manuscript presented in an intelligible fashion and written in standard English??> Reviewer #1: Yes Reviewer #3: Yes ********** Reviewer #1: The authors have addressed all the concerns raised in the previous round, and the manuscript has been notably strengthened in terms of parameter justification, methodological validation, and literature support. A few minor suggestions are as follows: 1. The introduction and literature review could be further enriched by including key references that specifically outline research progress and existing methodological gaps in conflict identification on curved road sections. 2. The theoretical contributions (e.g., proposing a unified framework for curved road conflict identification) and practical implications (e.g., supporting safety assessments in intelligent transportation systems) of this study should be summarized more explicitly. 3. The manuscript would benefit from additional language polishing. Reviewer #3: This paper proposes a traffic conflict detection method based on the Frenet coordinate system, aiming to address the identification bias of the conventional Time-to-Collision (TTC) metric on curved road segments caused by misalignment between the coordinate system and actual vehicle motion. The research topic is of clear practical relevance: with the increasing availability of high-precision trajectory data, accurately assessing microscopic traffic safety risks under complex road geometries has become a critical challenge in intelligent transportation systems and proactive safety applications. By adopting the Frenet coordinate system, the authors effectively decouple longitudinal and lateral vehicle dynamics on curves and demonstrate—using real-world trajectory data—the advantages of their approach in detecting severe conflict events such as rear-end collisions. Notably, the proposed method exhibits superior risk-capturing capability compared to traditional Cartesian-based methods, especially in transition zones between straight and curved segments. The manuscript is generally well-structured and reflects a conscientious response to the reviewers’ previous comments. Terminology and language expression have been noticeably improved, particularly through substantial enhancements in the methodological framework diagram, symbol definitions, and consistency across figures and tables, all of which contribute to better readability. Nevertheless, there remain several areas where the paper could be further strengthened. The specific modification suggestions are as follows: 1. Introduction needs to be further revised to highlight the existing research gaps. The current introduction provides a general overview of traffic safety and conflict detection but fails to clearly articulate the specific limitations of existing Time-to-Collision (TTC) methodologies in curved road environments. While it mentions the reactive nature of crash-based analysis, it does not sufficiently foreground the core methodological gap—namely, that conventional TTC frameworks rooted in Cartesian coordinates are ill-suited for accurately capturing vehicle dynamics on curves due to misalignment between coordinate axes and actual travel direction. 2. Why are minor accident cases not utilized? It is recommended to provide supplementary explanations. The introduction points out that one of the limitations of the traditional accident-based data method is that "minor accidents or severe conflicts that do not lead to accidents are often not recorded, yet they contain a wealth of safety information." However, the main text only focuses on "severe conflicts" with TTC < 3.0s, completely excluding consideration of minor/general conflicts. It fails to illustrate whether the new method is capable of capturing such unrecorded events, nor does it explain how to use such information to supplement safety assessments, which inadequately connects with the original intention of "supplementing the traffic event model" mentioned in the introduction. 3. Additional explanations regarding the rationale for selecting the research road segment are required to strengthen the rationality of the sample. The current study has not provided any elaboration on the rationale for the selection of the core research road segment. It only directly mentions that data was collected from a specific segment without explaining why this segment is suitable as a case for research on traffic conflicts on curved roads. Such an omission results in a lack of support for the scientificity and rationality of sample selection, leaving readers unable to judge whether the characteristics of this segment can represent the general attributes of the target research objects (e.g., curved roads), thereby affecting the credibility and promotional value of the research conclusions. 4. Literature review needs enhanced focus and integration of recent advances. The literature review currently presents relevant studies in a somewhat fragmented manner and lacks critical synthesis, particularly regarding recent developments in trajectory-based conflict detection (post-2020). Although Tarko’s alternative indicators (TD1/TD2) are mentioned, the discussion does not adequately contextualize how these relate to—or differ from—the proposed Frenet-TTC framework. 5. Conclusions need greater specificity on practical implications and limitations. The conclusion section remains overly descriptive and does not sufficiently differentiate this study from prior work in terms of actionable insights. It should explicitly state how the Frenet-based TTC framework can inform real-world applications This paper has a complete framework, clear research logic, and conclusions with certain theoretical and practical value. However, it is necessary to improve methodological details and the depth of discussion, supplement explanations on minor accident cases and the rationale for research road segment selection. It is recommended to review after major revision. ********** what does this mean? ). If published, this will include your full peer review and any attached files. If you choose “no”, your identity will remain anonymous but your review may still be made public. Do you want your identity to be public for this peer review? For information about this choice, including consent withdrawal, please see our Privacy Policy Reviewer #1: No Reviewer #3: No ********** [NOTE: If reviewer comments were submitted as an attachment file, they will be attached to this email and accessible via the submission site. Please log into your account, locate the manuscript record, and check for the action link "View Attachments". If this link does not appear, there are no attachment files.] To ensure your figures meet our technical requirements, please review our figure guidelines: https://journals.plos.org/plosone/s/figures You may also use PLOS’s free figure tool, NAAS, to help you prepare publication quality figures: https://journals.plos.org/plosone/s/figures#loc-tools-for-figure-preparation. NAAS will assess whether your figures meet our technical requirements by comparing each figure against our figure specifications. |
| Revision 2 |
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Traffic conflict identification method on curved road based on Frenet coordinate system PONE-D-25-40226R2 Dear Dr. Jiang, We’re pleased to inform you that your manuscript has been judged scientifically suitable for publication and will be formally accepted for publication once it meets all outstanding technical requirements. Within one week, you’ll receive an e-mail detailing the required amendments. When these have been addressed, you’ll receive a formal acceptance letter and your manuscript will be scheduled for publication. An invoice will be generated when your article is formally accepted. Please note, if your institution has a publishing partnership with PLOS and your article meets the relevant criteria, all or part of your publication costs will be covered. Please make sure your user information is up-to-date by logging into Editorial Manager at Editorial Manager® and clicking the ‘Update My Information' link at the top of the page. For questions related to billing, please contact billing support . If your institution or institutions have a press office, please notify them about your upcoming paper to help maximize its impact. If they’ll be preparing press materials, please inform our press team as soon as possible -- no later than 48 hours after receiving the formal acceptance. Your manuscript will remain under strict press embargo until 2 pm Eastern Time on the date of publication. For more information, please contact onepress@plos.org. Kind regards, Gen Li Academic Editor PLOS One Additional Editor Comments (optional): Reviewers' comments: |
| Formally Accepted |
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PONE-D-25-40226R2 PLOS One Dear Dr. Jiang, I'm pleased to inform you that your manuscript has been deemed suitable for publication in PLOS One. Congratulations! Your manuscript is now being handed over to our production team. At this stage, our production department will prepare your paper for publication. This includes ensuring the following: * All references, tables, and figures are properly cited * All relevant supporting information is included in the manuscript submission, * There are no issues that prevent the paper from being properly typeset You will receive further instructions from the production team, including instructions on how to review your proof when it is ready. Please keep in mind that we are working through a large volume of accepted articles, so please give us a few days to review your paper and let you know the next and final steps. Lastly, if your institution or institutions have a press office, please let them know about your upcoming paper now to help maximize its impact. If they'll be preparing press materials, please inform our press team within the next 48 hours. Your manuscript will remain under strict press embargo until 2 pm Eastern Time on the date of publication. For more information, please contact onepress@plos.org. You will receive an invoice from PLOS for your publication fee after your manuscript has reached the completed accept phase. If you receive an email requesting payment before acceptance or for any other service, this may be a phishing scheme. Learn how to identify phishing emails and protect your accounts at https://explore.plos.org/phishing. If we can help with anything else, please email us at customercare@plos.org. Thank you for submitting your work to PLOS ONE and supporting open access. Kind regards, PLOS ONE Editorial Office Staff on behalf of Dr. Gen Li Academic Editor PLOS One |
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