What evidence do friction and tyre marks on the bridge provide?

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Evidence Provided by Friction and Tyre Marks in Traffic Accidents

Friction and tyre marks photographed at the scene of the Penang Bridge accident offer crucial visual evidence regarding the dynamics of the collision. Corporal Abdul Rashid Mahmud, a traffic police photographer, presented 85 photographs taken on January 20 and January 22, detailing the accident and the subsequent retrieval of the involved Sports Utility Vehicle (SUV). These images included 23 photos of the accident itself, capturing the immediate aftermath of the collision between the SUV and a Toyota Vios.

The photographic evidence presented included specific details such as friction marks on the road divider and tyre marks on the road surface. These marks are direct physical traces left by the vehicles during the incident. The friction marks on the divider, for instance, can indicate the point and angle of impact between the two vehicles, suggesting how they came into contact and the forces involved. Similarly, tyre marks can provide information about the speed and direction of the vehicles immediately before and during the collision, and whether braking or evasive manoeuvres were attempted.

In accident reconstruction, such physical evidence is systematically analysed to understand the sequence of events. Friction marks, often appearing as dark streaks or scuffs, are created when the surfaces of the vehicles or their components scrape against the road or divider. Their length and intensity can help investigators estimate the energy transfer during the impact. Tyre marks, which can include skid marks (straight lines indicating locked wheels) or scuff marks (indicating turning or sliding), offer insights into the vehicle's trajectory and the driver's actions.

The photographs also documented the broader scene, including the impact's severity and the complex process of retrieving the SUV from the seabed. While the provided information details the existence and types of marks photographed, further forensic analysis would typically be required to translate these visual cues into definitive conclusions about vehicle speeds, driver actions, and the precise mechanics of the crash. The inclusion of 34 post-mortem photos further underscores the fatal nature of the incident and the comprehensive nature of the investigation.

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What evidence do friction and tyre marks on the bridge provide?

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