Enhancing Traffic Efficiency and Sustainability through Strategic Placement of Roadside Units and Variable Speed Limits in a Connected Vehicle Environment
, Pierre-Antoine Laharotte 2, Eleonore Fauchet 2, Hugues Blache 2 and Nour-Eddin El Faouzi 2,3,*Round 1
Reviewer 1 Report
Comments and Suggestions for AuthorsThe use of Variable Speed ​​Limit (VSL) service is an interesting tool that can have many applications in the field of traffic and emissions management strategies from road transport. The reviewed manuscript presents selected research results in this field. I see many advantages of this work and it constitutes valuable material for implementation activities in this field, however, it requires certain additions and corrections before being allowed for publication.
Major comments:
The abstract should be supplemented with at least one main effect of this work.
The short literature review in Section 1 (Introduction) on the impact of the telecommunication network on traffic and the environment is limited to one review article from 2021 published in the form of a preprint. Meanwhile, since then, many studies have been published assessing the impact of selected traffic management strategies on the environment, mainly on reducing pollutant emissions and improving air quality. It is therefore necessary to expand the review of the state of knowledge on this topic and refer to the latest works published in this field. There are also many scientific publications relating to the very problem of using Variable Speed ​​Limit (including in Sustainability). In this case, the literature review should also be more detailed.
Section 2 (Methodology) requires explanation of how CO2 and NOx emissions are measured on equipped vehicles or simulated by simulation tools. The abbreviations CV and MPR should be explained upon first use.
In Section 3 (Experimentation Results and Analysis), the statement "Despite similar trends in CO2 and NOx emissions, higher benefits are observed for NOx emissions at high MPR of Connected Vehicles, while CO2 emission benefits are higher at low MPR" (lines 291-293) requires discussion (explanation of the reason). Generally, in the discussion (analysis of results), it is recommended to refer to the results obtained by other authors, if known.
Section 4 (Conclusion) generally summarizes the research conducted, but unfamiliar or specific abbreviations should not be used in this section, even if they have been previously explained. The content of the last two sentences from Section 4 (lines 351-354) is recommended to be moved to Section 1.
Minor comments:
It is recommended to avoid unnecessary distinctions in the text of the manuscript (apart from section headings and markings of tables and figures), e.g. the use of bold or italic fonts.
In accordance with the guidelines for authors, instead of the abbreviation "Fig." in text references to figures, "Figure" should be used.
Individual components of composite figures should have the markings (a), (b)... instead of a, b... In the case of Figure 1, it is recommended to enter its general title and only then explain the component figures in this title after a colon.
No literature reference in the sentence "The VSL algorithm is detailed in the report [?]..." (line 114).
There should be spaces between values ​​and units, also in the case of the unit [m], [s], [km] or [km/h] (including lines 133, 135, 159, 162, 164, 187, 196, 227-230, 254).
The speed units used in the manuscript (in the text and descriptions of figures) should also be unified, such as [km/h] or [kmph]. In Figure 9, instead of [Km/h], it should be [km/h].
Journal titles in References section should be capitalized (lines 388, 405, 397-398). In accordance with the guidelines for authors, it is also recommended to supplement the list of published works with missing DOI numbers, if any.
Author Response
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Author Response File: 
Author Response.pdf
Reviewer 2 Report
Comments and Suggestions for AuthorsThe authors present "Enhancing Traffic Efficiency and Sustainability through Strategic Placement of Roadside Units and Variable Speed ​​Limits in a Connected Vehicle Environment."
The work is appropriate and applied to sustainability using telecommunications tools.
The study of traffic and the pollution caused by it is a topic of general interest and must be addressed with all available tools. In this study the authors propose algorithms that are tested in different environments and in what they call a microsimulation.
The results are adequate with the study.
Author Response
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Author Response File: Author Response.pdf
Reviewer 3 Report
Comments and Suggestions for AuthorsContent
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The goal of this paper is to analyse traffic efficiency and emission pollutant when the C-ITS services disseminate dynamic messages. Proposed methods require 3 steps to adopt methodology: Calibration for a Highway Environment, Validation for VSL Application and Experiment Design. Following this methodical progression, the experimental phase is executed with a simulation-based comparative analysis of the VSL implementation scenario. This analysis performs the traditional dissemination of variable speed limits via Variable Message Signs (VMS) with the current paradigm, thereby elucidating the differential impacts across varying degrees of market penetration.
Minor comments
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1. Figure 1
The classification of vehicle categories has no impact on the subsequent experiments. Considering that this is mentioned in the paper as the default model parameters, please mention it in the subsequent experiments. It is suggested that the explanation given for the appearance of Figure 1-C is not convincing, please reorganize the language.
Figure 1-d illustrates the convergence of the Genetic Algorithm (GA), indicating that the objective function stabilizes at a constant value between the 60th and 100th iterations, signifying that the optimal solution has been achieved by the 60th iteration. Within this range, solution quality remains consistent. However, the precision of the expressions on Lines 100 and 105 requires refinement for clarity and accuracy.
2. Line 114
Which quote is represented by the symbol ‘?’, what’s the reference?
This paper demonstrates the ability to perform based on the location of the RSU and the performance of effective road network coverage through multiple sets of comparative experiments.The data is persuasive.
Evaluations
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Given the above, I'm in a position to minor revision.
Comments on the Quality of English LanguageModerate editing of English language required
Author Response
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Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
Comments and Suggestions for AuthorsI would like to thank the authors for taking into account my comments in the revised version of the manuscript and answering certain doubts. Once they were introduced into the text of the manuscript, they made it more understandable. In my opinion, the work does not require any further significant changes or additions.
