Last Thursday, a garbage truck driving in the wrong direction on a street in San Mateo de Gállego, Zaragoza, violently collided with a house near the Palacio de los Deportes in Huesca. Fortunately, the driver was unharmed and the house was empty, but the incident provides a perfect case for forensic analysis through 3D reconstruction, allowing the study of the accident dynamics and the causes of the trajectory error.
Photogrammetry and dynamic simulation of the collision 🚛
The virtual reconstruction begins with scene capture using photogrammetry, utilizing official images from the Zaragoza Fire Department and the Civil Guard to generate a high-fidelity 3D model of the environment, including the street, the damaged facade, and the wrecked truck. Subsequently, the vehicle's reverse trajectory is simulated from the impact point back to its origin, calculating the speed and entry angle. Visibility analysis from the cab, considering the steering wheel's blind spot and possible obstruction by the dashboard, allows contrasting the hypothesis of human error with the possibility of a mechanical failure in the steering system.
Forensic lessons for accident prevention 🔍
The comparison between the digital simulation and physical evidence, such as skid marks and wall deformation, confirms that the impact occurred at low speed, explaining the absence of injuries. This case underscores the importance of integrating 3D models into urban accident investigation, not only to clarify responsibilities but also to design road safety measures, such as signage for narrow roadways or wrong-direction alert systems in heavy vehicles.
Would you place scale witnesses before scanning?