Use of computer simulations in geometrical modelling of road intersections

Bezina, Šime · 2017 · Crossref

DOI: 10.5592/co/zt.2017.10

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Summary

This paper addresses the application of computer simulations in the geometric modeling of road intersections, specifically focusing on swept path analysis for design vehicles. The motivation stems from the increasing integration of information technology in civil engineering and the need for accurate, efficient methods to verify that intersections accommodate the movement of large vehicles. Traditional methods, such as graphical templates, numerical calculations, and physical models, are often less precise or more cumbersome than modern computational approaches. The study aims to describe how computer simulations can replace these older techniques to ensure that intersection designs meet safety and capacity requirements by accurately modeling vehicle trajectories. The paper reviews the characteristics and limitations of specialized software programs, notably Vehicle Tracking and AutoTURN, which are widely used for simulating vehicle movement. These programs allow engineers to define arbitrary vehicle dimensions, steering angles, and guide lines to generate precise trajectory paths. The authors note that while simulations ignore dynamic factors like wind, acceleration, and friction, comparative studies cited in the text demonstrate that simulation results deviate from real-world polygon tests by amounts within standard construction tolerances. Furthermore, comparisons between different software packages show negligible differences (±4.0 cm) in calculated swept path widths, confirming their reliability. The paper also outlines the standard three-step design process: shaping intersection elements, checking passability for a selected design vehicle, and correcting elements if conditions are not met. Design vehicle selection is guided by traffic structure and EU directives, with specific vehicles like three-axle buses identified as critical for determining maximum swept path widths. The findings highlight significant drawbacks in current design practices, particularly the reliance on post-design verification. The traditional approach involves designing intersection elements first and then checking for passability, which often requires iterative corrections and is time-consuming. Additionally, the use of physical templates is criticized for its lack of flexibility, as templates are limited to specific radii and scales, and their accuracy relative to real vehicle behavior is unverified. The study concludes that computer simulations offer a superior alternative due to their speed, precision, and ability to model various vehicle types and steering scenarios. The significance of this work lies in its recommendation to shift the fundamental principle of intersection design. Instead of verifying passability after initial geometric shaping, the authors argue that vehicle movement geometry should serve as the starting point for designing intersection elements. This proactive approach would reduce design time and improve accuracy. The paper emphasizes that adopting reliable computational tools is essential for ensuring that intersection designs faithfully reflect real-world vehicle dynamics, thereby enhancing the efficiency and safety of road infrastructure planning.

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• intersection design