Special Issue "Roundabouts Performance in Road Transport Networks - Future Challenges, Problems and Issues"

A special issue of Sustainability (ISSN 2071-1050). This special issue belongs to the section "Sustainable Transportation".

Deadline for manuscript submissions: 31 December 2021.

Special Issue Editors

Prof. Dr. Elżbieta Macioszek
E-Mail Website
Guest Editor
Faculty of Transport and Aviation Engineering, Department of Transport Systems, Traffic Engineering, and Logistics, Silesian University of Technology, 40-019 Katowice, Poland
Interests: traffic engineering; civil engineering; transport
Special Issues and Collections in MDPI journals
Prof. Tomaž Tollazzi
E-Mail Website
Guest Editor
Faculty of Civil Engineering, Transportation Engineering and Architecture, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
Interests: sustainable safe road infrastructure design, with particular focus on intersections, interchanges, roundabouts, and vulnerable road users
Prof. Tullio Giuffrè
E-Mail Website
Guest Editor
Faculty of Engineering and Architecture, University of Enna Kore, Viale della Cooperazione, 94100 Enna, Italy
Interests: road safety evaluation; road design; connected automated vehicles operations; transport infrastructure; traffic operations modeling; statistical analysis

Special Issue Information

Dear Colleagues,

Many different layouts and sizes can be used to design modern roundabouts. The type of roundabout is determined by various factors, such as space availability, traffic volume, expected and-users, location, etc. Roundabouts are often used to improve traffic safety and capacity in urban and rural areas and can also be employed as a measure for traffic calming instead of signal-controlled intersections.

This Special Issue will consist of papers describing the synthesis of current theory and practice of planning, design, operation, and safety of modern roundabouts, with special attention on future challenges and will be of interest to scientists dealing with roundabouts problems and issues and generally involved in road traffic engineering as well as design, traffic, and maintenance engineers. Other major areas of interest with regard to roundabouts include but are not limited to:

- Efficiency evaluation;

- Traffic capacities and delays;

- Issues related to pedestrians, bicyclists, and visually impaired users;

- Costs and location criteria;

- Road traffic measurements, data analysis;

- Traffic flow modeling;

- Signing and pavement markings;

- Signalized roundabouts;

- Experimental analysis for roundabouts;

- Autonomous vehicles on roundabouts;

- Driver behavior patterns on roundabouts;

- Conflicts at roundabouts.

Prof. Elżbieta Macioszek
Prof. Anna Grana
Prof. Tomaž Tollazzi
Prof. Tullio Giuffrè
Guests Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sustainability is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Road traffic engineering
  • Road transport network
  • Modern roundabouts

Published Papers (5 papers)

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Research

Article
Safety Evaluation of Flower Roundabout Considering Autonomous Vehicles Operation
Sustainability 2021, 13(18), 10120; https://doi.org/10.3390/su131810120 - 09 Sep 2021
Viewed by 314
Abstract
With the significant technological growth that affected autonomous vehicles in the last decade, several consequences occurred as: human factor exclusion, entry and exit manoeuvres precision from roundabouts, and headway reduction. In this paper, it was carried out a microsimulation approach study that aims [...] Read more.
With the significant technological growth that affected autonomous vehicles in the last decade, several consequences occurred as: human factor exclusion, entry and exit manoeuvres precision from roundabouts, and headway reduction. In this paper, it was carried out a microsimulation approach study that aims to evaluate benefits in terms of safety obtained with flower roundabouts in a scenario where traffic is characterized by conventional vehicles “CVs” and Connected Autonomous Vehicles “CAVs”. This study focused on the evaluation of CAVs and CVs operation with the presence of the so called “weak users” or rather, pedestrians and bikes. Then, simulated scenarios were characterized by the presence of zebra-crossings in main roads, positioned at 20 m from circulatory carriageway edges. Micro simulation choice is due to the absence of survey data collection because the presence of CAVs in ordinary traffic is still minimal. The micro simulation was carried out through VISSIM, so it was operated with a specific methodological path, consisting, in the application, of O–D matrix based on real cases, in order to achieve an assessment of potential conflicts in relation with the increase in CAVs. Simulation results showed that higher safety levels were achieved for special cases of O–D distribution and with CAVs present. Finally, considering crash absence in results related to CAVs presence, safety interventions of such roundabout types have to be thorough. There were 10 O/D matrices analysed through VISSIM considering parameters as: average tail length, maximum tail length, average speed, vehicles, and number of stops quantity. As reported in the conclusion section, O/D matrices that showed minimum conflicts and maximum dynamic performances were identified. Full article
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Article
Safety Evaluation of Turbo-Roundabouts with and without Internal Traffic Separations Considering Autonomous Vehicles Operation
Sustainability 2021, 13(16), 8810; https://doi.org/10.3390/su13168810 - 06 Aug 2021
Cited by 1 | Viewed by 304
Abstract
The paper presents a microsimulation approach for assessing the safety performance of turbo-roundabouts where Cooperative Autonomous Vehicles “CAVs” have been introduced into the traffic mix alongside conventional vehicles “CVs”. Based on the analysis of vehicle trajectories from VISSIM and subsequent analysis of traffic [...] Read more.
The paper presents a microsimulation approach for assessing the safety performance of turbo-roundabouts where Cooperative Autonomous Vehicles “CAVs” have been introduced into the traffic mix alongside conventional vehicles “CVs”. Based on the analysis of vehicle trajectories from VISSIM and subsequent analysis of traffic conflicts through the Surrogate Safety Assessment Model (SSAM), the research aims to evaluate the safety benefits of turbo-roundabouts where the lanes are physically separated by raised curbs, compared to roundabouts without such curbs. The paper will then describe the methodological path followed to build VISSIM models of turbo-roundabouts with and without raised curbs in order to calibrate the simulation models and estimate the potential conflicts when a higher percentage of CAVs are introduced into the traffic mix. A criterion has been also proposed for setting properly the principal SSAM filters. The results confirmed both higher safety levels for turbo-roundabouts equipped with raised lane dividers compared to turbo-roundabout solutions without curbs, and better safety conditions under the traffic mix of CVs and CAVs. Therefore, it follows that, in absence of crash data including CAVs, the surrogate measures of safety are the only approach in which the safety performance of any roundabout or road entity can be evaluated. Full article
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Article
Data-Driven Scenario Specification for AV–VRU Interactions at Urban Roundabouts
Sustainability 2021, 13(15), 8281; https://doi.org/10.3390/su13158281 - 24 Jul 2021
Viewed by 482
Abstract
Detailed specifications of urban traffic from different perspectives and scales are crucial for understanding and predicting traffic situations from the view of an autonomous vehicle (AV). We suggest a data-driven specification scheme for maneuvers at different design elements of the built infrastructure and [...] Read more.
Detailed specifications of urban traffic from different perspectives and scales are crucial for understanding and predicting traffic situations from the view of an autonomous vehicle (AV). We suggest a data-driven specification scheme for maneuvers at different design elements of the built infrastructure and focus on urban roundabouts in Germany. Based on real observations, we define classes of maneuvers, interactions and driving strategies for cyclists, pedestrians and motorized vehicles and define a matrix for merging different maneuvers, resulting in more complex interactions. The sequences of these interactions, which partially consist of explicit communications, are extracted from real observations and adapted into microscopic traffic flow simulations. The simulated maneuver sequences are then visualized in 3D environments and experienced by bicycle simulator test subjects. Using trajectory segments (in fictional space) from two conducted simulator studies, we relate the recorded movement patterns of test subjects with observed cyclists in reality. Full article
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Article
Modeling the Influence of Roundabout Deflection on Its Efficiency as a Noise Abatement Measure
Sustainability 2021, 13(10), 5407; https://doi.org/10.3390/su13105407 - 12 May 2021
Cited by 1 | Viewed by 427
Abstract
Challenges that emerge in roundabout design are mostly related to space constrictions and provision of appropriate deflection around the central island. This can result in speed profiles on roundabouts that might reduce their potential as a noise abatement measure. Because of this, the [...] Read more.
Challenges that emerge in roundabout design are mostly related to space constrictions and provision of appropriate deflection around the central island. This can result in speed profiles on roundabouts that might reduce their potential as a noise abatement measure. Because of this, the impact of a roundabout on noise levels and its applicability as a traffic calming device and a noise abatement measure should be investigated in the early design stage, by modeling noise levels. In this paper, the following hypothesis is tested: vehicle movement trajectories, defined during the fastest path performance check in roundabout early design phase, can be used as the road traffic noise sources when modeling noise at roundabouts using static noise model. This procedure (1) simplifies the preparation of the noise model, (2) results in a model that is closer to the real-world in terms of traffic flow conditions, (3) allows the noise calculations in the early stages of roundabout design, and (4) includes the influence of roundabout deflection on calculated noise levels. The abovementioned simplifications of the road traffic noise modeling process should encourage the optimization of roundabout geometry in terms of its noise reduction capabilities in the preliminary design phase of these intersections. Full article
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Article
Roundabout Entry Capacity Calculation—A Case Study Based on Roundabouts in Tokyo, Japan, and Tokyo Surroundings
Sustainability 2020, 12(4), 1533; https://doi.org/10.3390/su12041533 - 18 Feb 2020
Cited by 12 | Viewed by 1079
Abstract
The article presents the calculation of roundabout entry capacity as a case study based on roundabouts located in Tokyo, Japan, and Tokyo surroundings. The analysis was conducted as part of the project entitled “Analysis of the applicability of the author’s method of roundabouts [...] Read more.
The article presents the calculation of roundabout entry capacity as a case study based on roundabouts located in Tokyo, Japan, and Tokyo surroundings. The analysis was conducted as part of the project entitled “Analysis of the applicability of the author’s method of roundabouts entry capacity calculation developed for the conditions prevailing in Poland to the conditions prevailing at roundabouts in Tokyo (Japan) and in the Tokyo surroundings”. The main aim and the research question was whether the author’s model of roundabouts entry capacity calculation constructed for the conditions prevailing in Poland after calibration is suitable to calculate roundabout entry capacity of roundabouts located in Tokyo and in the Tokyo surroundings. In order to perform the calibration in 2019, measurements were taken at the single-lane roundabouts located in Tokyo and Tokyo surroundings. The model calibration revealed that it is possible to evaluate the entry capacity of roundabouts located in Tokyo and in Tokyo surroundings using the author’s model. Full article
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