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Related Experiment Video

Updated: May 22, 2026

Evaluation of an Exclusive Spur Dike U-Turn Design with Radar-Collected Data and Simulation
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Conflict angle analysis at multilane roundabouts using naturalistic vehicle trajectory data from UAVs.

Apostolos Anagnostopoulos1, Apostolos Ziakopoulos2, Fotini Kehagia1

  • 1Department of Civil Engineering, Aristotle University of Thessaloniki, Thessaloniki, Greece.

Traffic Injury Prevention
|May 20, 2026
PubMed
Summary

This study analyzed conflict angles at Greek multilane roundabouts using Unmanned Aerial Vehicle (UAV) data. Conflict location and site-specific features significantly impact safety, informing infrastructure design for improved traffic management.

Keywords:
PETTraffic conflict techniqueUAVconflict angleroundaboutsurrogate safety measure

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Area of Science:

  • Traffic Engineering
  • Road Safety Analysis
  • Transportation Planning

Background:

  • Modern roundabouts enhance traffic safety by reducing speeds and conflict points.
  • Assessing safety performance of multilane roundabouts in Greece is crucial due to their increasing number.
  • Existing research often lacks detailed analysis of specific conflict dynamics.

Purpose of the Study:

  • To investigate conflict angles at modern multilane roundabouts in Greece using naturalistic vehicle trajectory data.
  • To employ Surrogate Safety Measures (SSMs) to analyze factors influencing conflict angles.
  • To provide novel insights into roundabout safety using Unmanned Aerial Vehicle (UAV) data.

Main Methods:

  • Collected detailed vehicle trajectory data from four multilane roundabouts via UAV recordings.
  • Calculated Post-Encroachment Time (PET) and developed a dataset with driving behavior variables.
  • Applied a mixed-effects Beta-regression Model (BRM) to model conflict angles and identify influencing parameters.

Main Results:

  • Conflict location within the roundabout was found to significantly affect conflict angles.
  • Site-specific geometric and vehicular characteristics demonstrated a substantial impact on safety outcomes.
  • Roundabout safety performance exhibits variability depending on location and specific site features.

Conclusions:

  • Findings offer new insights into factors influencing conflict angles at multilane roundabouts.
  • Results have implications for vehicle dynamics and infrastructure design strategies.
  • Supports policymakers and engineers in developing targeted safety improvement measures for modern roundabouts.