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Sustainability
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Recent Advances and Innovations in Urban Road Safety
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Recent Advances and Innovations in Urban Road Safety

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

Deadline for manuscript submissions: 30 June 2026 | Viewed by 1958

Special Issue Editor

Prof. Dr. Fotini Kehagia

E-Mail Website
Guest Editor
Highway Laboratory, Division of Transportation and Construction Management, School of Civil Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
Interests: road design; road safety; sustainable infrastructure; sustainable mobility
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

With the launch of the Second UN Decade of Action for Road Safety and its target to halve road deaths and injuries by 2030, all cities need to adopt measures that have proven to be effective.

Under the UN Sustainable Development Goals (SDGs), the SDG11.2 (make cities and human settlements inclusive, safe, resilient, and sustainable) explicitly mentions the need for road-related injury prevention. Safer streets are crucial for making cities more liveable. Reducing the risks of urban traffic not only saves lives, but also opens doors to sustainable forms of transport (walking, cycling), which can reduce pollution, cut emissions, fight congestion, and improve citizens’ physical and mental health.

Technology plays an important role in addressing road safety challenges by providing innovative solutions for improving infrastructure, mitigating risks, and improving driver behaviour.

Innovative technologies and road safety have brought about a new era of possibilities, providing solutions that not only address current issues, but also lay the groundwork for a future on our roads that is safer and more efficient.

This Special Issue aims to present state-of-the-art research related to the latest advancements and innovations in road infrastructure and, in general, the ways in which urban road systems can make cities safer. Contributors are encouraged to present case studies and empirical research that demonstrate how innovative technology approaches and smart infrastructure can be employed to achieve these goals.

Prof. Dr. Fotini Kehagia
Guest Editor

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 submissions that pass pre-check are 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 250 words) can be sent to the Editorial Office for assessment.

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 2400 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 safety
  • urban road system
  • accidents
  • smart infrastructure
  • technology

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Published Papers (2 papers)

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Research

28 pages, 46412 KB  
Article
Application of the SSAM in the Safety Analysis of Combined Roundabout and Signalized Intersections Under Different Traffic Conditions
by Mirna Klobučar, Sanja Šurdonja, Aleksandra Deluka-Tibljaš and Irena Ištoka Otković
Sustainability 2026, 18(3), 1321; https://doi.org/10.3390/su18031321 - 28 Jan 2026
Viewed by 473
Abstract
In urban corridors, roundabouts often operate in close proximity to signalized intersections, yet the safety implications of their mutual interaction remain insufficiently explored. This study combines field measurements and VISSIM (PTV VISSIM Academic 2023, SP 5) microsimulation with the Surrogate Safety Assessment Model [...] Read more.
In urban corridors, roundabouts often operate in close proximity to signalized intersections, yet the safety implications of their mutual interaction remain insufficiently explored. This study combines field measurements and VISSIM (PTV VISSIM Academic 2023, SP 5) microsimulation with the Surrogate Safety Assessment Model (SSAM) to analyze roundabout–signalized intersection pairs under varying outer radii (12–22 m), spacings (40–160 m), signal red times (17–27 s), and traffic distributions. A multiple linear regression model for predicting the total number of conflicts is developed and partially validated using calibrated real-site models for corridors in Osijek and Poreč, Croatia. Small spacings (40 m) increase the total number of conflicts by 40–60% for small roundabouts (R = 12 m) and 20–40% for larger radii compared with isolated operation. Increasing the outer radius (inscribed circle radius) from 12 to 17 m reduces conflicts by up to about 90%, while longer red times further lower conflicts, especially for small roundabouts. The final regression model, based on spacing, red time, and outer radius, explains about 80% of the variance in conflicts and shows good agreement with SSAM estimates within its applicability range, providing a practical tool for safety-oriented design of urban roundabout–signalized intersection corridors, thereby contributing to the goals of developing a sustainable transport system in a complex urban environment. Full article
(This article belongs to the Special Issue Recent Advances and Innovations in Urban Road Safety)
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34 pages, 15793 KB  
Article
A Methodological Approach to Identifying Unsafe Intersections for Micromobility Users: A Case Study of Vilnius
by Vytautas Grigonis and Jonas Plačiakis
Sustainability 2025, 17(24), 11053; https://doi.org/10.3390/su172411053 - 10 Dec 2025
Cited by 3 | Viewed by 832
Abstract
Cities are increasingly integrating micromobility, which heightens the need for robust analytical methods to identify high-risk intersections. This study presents a three-stage methodological approach that combines six years of accident data, spatial hotspot analysis, and calibrated floating-car traffic data to estimate exposure and [...] Read more.
Cities are increasingly integrating micromobility, which heightens the need for robust analytical methods to identify high-risk intersections. This study presents a three-stage methodological approach that combines six years of accident data, spatial hotspot analysis, and calibrated floating-car traffic data to estimate exposure and calculate intersection crash rates in Central Vilnius. Testing the proposed approach identified eight high-risk intersections, with intersection crash rates (ICR) ranging from 0.044 to 0.151, indicating substantial differences in exposure-adjusted risk across the network. The validation of floating-car data (FCD) produced a determination coefficient (R2) of 0.87, confirming reliable exposure estimates where traditional traffic counts are not available. One selected intersection was analyzed in greater depth using drone-based observations and conflict assessment, leading to two redesign alternatives. Both reduced conflicts, though the signalized option eliminated uncontrolled conflict points and offered the strongest expected safety improvement. The suggested methodological approach demonstrates how integrating accident data, exposure estimation, and behavioral analysis can support evidence-based scalable interventions to improve micromobility safety. Despite certain limitations, it enables the rapid identification of problematic intersections, provides site-specific safety diagnosis, and facilitates the development of data-driven design improvements to enhance the safety of micromobility users. As the world strives to shift towards greater sustainability, the concept of micromobility, defined as the use of lightweight, short-distance modes of transport, has gained growing attention among users and policymakers. Full article
(This article belongs to the Special Issue Recent Advances and Innovations in Urban Road Safety)
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