In 2023, Australia recorded 1,266 road fatalities — a 7.3% increase from the previous year and the highest national toll since 2017. Western Australia accounted for 158 of these deaths, reflecting a 9% decrease from 2022 but still highlighting the persistent challenges in road safety. These figures, sourced from the Bureau of Infrastructure and Transport Research Economics (BITRE) and the WA Road Safety Commission, underscore the urgent need for public awareness and proactive measures to prevent car crashes. For drivers and passengers in WA, understanding the causes of a car crash, adopting proven prevention strategies, and knowing the correct legal steps to take after a collision are essential. The economic and social impact of road trauma in Australia exceeds $30 billion annually. Education, infrastructure planning, and strict adherence to road safety protocols remain the most effective tools for reducing car crash risks and ensuring safer roads for all.
Vehicle Impact: Understanding the First Phase of a Car Crash Accident
The vehicle impact is the initial and most recognisable phase of a car crash. It occurs when a vehicle collides with another object — whether that’s another car, a roadside barrier, a tree, or a fixed structure like a power pole. This stage plays a crucial role in determining the severity of injuries sustained in a motor vehicle crash, and it’s one of the key factors assessed in personal injury claims and accident reconstructions across Western Australia.
What Influences the Severity of a Vehicle Impact?
Several variables combine to determine the force generated during a crash:
- Vehicle speed at the time of impact
- Weight and size of the vehicle
- Angle and point of collision
- Type of object struck
- Braking distance and stopping time
Among these, speed has the greatest influence. The force of a crash doesn’t increase in a straight line — it increases exponentially. For example, doubling your speed quadruples the impact force. This is why even a small increase in driving speed can lead to a significantly higher risk of serious injury or death in a car crash.
Modern Vehicle Design and Crash Safety
While older vehicles were constructed with rigid frames that transferred impact energy directly to occupants, modern cars sold in Western Australia are designed with crumple zones that absorb crash energy. These zones are engineered to collapse in a controlled way during a collision, protecting the interior passenger cabin from damage.
It’s common to see newer vehicles appear heavily damaged after a relatively low-speed crash — but this visual damage is intentional. The design reduces the force passed on to occupants, ultimately helping to lower the risk of injury.
In Australia, all new vehicles must meet Australian Design Rules (ADR) for crash safety and performance. Organisations like the Australasian New Car Assessment Program (ANCAP) test and rate vehicles on their crashworthiness, providing consumers with transparency when choosing safer vehicles.
Why Vehicle Impact Matters in a Legal or Insurance Claim
In motor vehicle accident claims, especially in WA, understanding the physics of the vehicle impact is critical. It forms the basis for assessing the potential severity of injuries, identifying liability, and estimating vehicle damage. This data can support your legal team, insurers, and medical professionals in accurately evaluating your situation — without relying on exaggerated claims or unrealistic promises.
Body Impact: What Happens to Occupants in a Car Crash
Body impact refers to the moment during a car crash when vehicle occupants collide with internal surfaces or objects inside the cabin. It is the second critical phase of a motor vehicle accident and often contributes significantly to serious injuries or fatalities, particularly in high-speed collisions or where proper restraints aren’t used.
Internal Hazards: Unsecured Objects Become Projectiles
During a collision, unsecured items inside the vehicle — such as glass bottles, mobile phones, laptops, or even children’s toys — can become dangerous projectiles. These items can travel at high speed and strike occupants with significant force. If they impact sensitive areas such as the head, face, or neck, the risk of traumatic brain injury or spinal cord damage increases considerably.
For this reason, it’s vital to safely stow all loose objects before driving, especially in the event of a rear-end crash, T-bone collision, or rollover accident — all of which are common on Western Australian roads.
The Role of Inertia: Your Body Keeps Moving
One of the most misunderstood aspects of car crash physics is inertia — the natural tendency of a body in motion to remain in motion. When a vehicle stops suddenly in a collision, an unrestrained body inside the car will continue to move forward at the vehicle’s pre-crash speed. This forward momentum causes the body to collide with the dashboard, windscreen, steering wheel, or other hard surfaces inside the car.
In Western Australia, seatbelt use is legally mandated and plays a critical role in reducing the risk of serious injury or death. A properly fastened seatbelt restrains the occupant, distributing force across stronger parts of the body (like the chest and pelvis) and preventing more severe secondary impacts.
Ejection and Trauma: The Consequences of Not Wearing a Seatbelt
Occupants who are not wearing seatbelts are at significantly higher risk of:
- Hitting interior vehicle structures (e.g., dashboard, windows, or seatbacks)
- Being ejected from the vehicle, particularly through windshields or side windows
- Sustaining severe head injuries, spinal injuries, or blunt force trauma
In fact, studies show that unrestrained occupants are more likely to suffer fatal injuries, and ejection from the vehicle almost always results in life-threatening consequences. WA’s road safety data continues to highlight the importance of seatbelt compliance as a primary factor in crash survivability.
Body Impact and Injury Claims in WA
Understanding the mechanics of body impact is crucial when assessing injuries for motor vehicle accident claims in Western Australia. Medical professionals, insurers, and legal experts evaluate the nature and force of this impact to determine the extent of injuries, required treatment, and potential compensation — all within the framework of local legislation and road safety standards.
Organ Impact: How Internal Injuries Occur in Car Accidents
Organ impact refers to the internal trauma that occurs when a person’s body comes to a sudden stop in a car crash, but their internal organs continue to move due to inertia. This phenomenon is often hidden from view, yet it can lead to some of the most serious — and sometimes life-threatening — injuries sustained in motor vehicle accidents.
The Mechanics of Internal Organ Damage
Inside the human body, most organs are either suspended in place by connective tissues like ligaments or partially free-floating within body cavities. In a high-impact collision, the sudden deceleration causes the external body to stop — while internal organs such as the liver, spleen, or intestines continue moving forward.
This motion can:
- Stretch or tear soft tissues like muscles, tendons, or ligaments, causing internal bruising and inflammation.
- Fracture solid organs such as the liver or spleen, which can lead to internal bleeding.
- Rupture blood vessels, including major arteries or veins connected to the heart, causing massive internal blood loss — a potentially fatal condition if not treated urgently.
In Western Australia, emergency services frequently deal with cases where internal organ trauma is not immediately visible at the crash scene. This makes prompt medical evaluation after any car accident critical, even if external injuries appear minor.
Concussion and Brain Trauma: A Specific Type of Organ Impact
One of the most severe forms of organ impact involves the brain, especially in cases of concussion or traumatic brain injury (TBI).
Here’s what happens:
- When the head is thrown forward, the brain continues moving inside the skull, striking the inner front wall of the cranium.
- If the head is then whipped backward, the brain can rebound and strike the rear of the skull.
- This back-and-forth motion causes the brain to bruise (contusion) or even bleed, leading to swelling, loss of consciousness, disorientation, and, in severe cases, long-term cognitive impairment.
Unlike external injuries, the effects of brain trauma may not be immediately evident. Symptoms such as confusion, dizziness, vomiting, or memory loss may develop hours later. That’s why, under WA health guidelines, anyone experiencing a head impact in a car crash should undergo immediate medical assessment, even if symptoms seem mild.
Why Internal Injuries Matter in Legal and Medical Assessments
In Western Australian personal injury claims, internal organ injuries are treated with the highest level of seriousness. These injuries often require surgical intervention, extended hospital stays, and long-term rehabilitation. Legal professionals and insurers will work closely with medical experts to evaluate the extent of internal damage when determining compensation eligibility and treatment needs.
Importantly, organ injuries may not show up on routine physical exams, making diagnostic imaging (e.g., CT scans, MRIs, ultrasound) a crucial step in post-accident care.
Conclusion
Understanding the three types of impact in a car crash — vehicle impact, body impact, and organ impact — is essential for anyone navigating road safety in Western Australia. These impacts don’t just affect physical health; they can influence legal outcomes, insurance assessments, and even the viability of a business reliant on transport. Whether you’re a commuter, a logistics provider, or a rideshare operator, car crashes can have far-reaching consequences. Proactive safety measures, vehicle maintenance, and awareness of the physics behind collisions can drastically reduce risk. Businesses should also have clear post-accident protocols to protect employees and reduce downtime. As road trauma continues to cost Australians billions annually, education remains a powerful tool in saving lives — and livelihoods. Prevention starts with knowledge and responsible action behind the wheel.
Disclaimer:
This article is provided for general information purposes only and does not constitute legal or medical advice. The content is based on publicly available data and does not account for your individual circumstances. Always seek professional advice from a qualified legal practitioner or healthcare provider regarding your specific situation. Soul Legal does not make any guarantees or predictions about legal outcomes.
Frequently Asked Questions (FAQs)
What are the three types of impact in a car crash?
The three types of impact are vehicle impact, body impact, and organ impact — each causing different injuries based on crash dynamics.
How does vehicle impact affect injury severity?
Vehicle impact determines how much force is transmitted during a crash. Speed, angle, and vehicle size all influence the injury risk.
What is body impact in a car crash?
Body impact happens when a person strikes the interior of the vehicle or is hit by loose objects during a collision.
What injuries result from organ impact?
Organ impact can lead to internal bleeding, ruptured organs like the liver or spleen, or brain trauma due to sudden deceleration.
Can a car crash cause brain injuries without head trauma?
Yes. Even without hitting your head, rapid movement can cause the brain to strike the skull internally, leading to concussion or TBI.
Why is understanding crash physics important for businesses?
Businesses with drivers must understand impact mechanics to implement effective safety policies and protect staff and operations post-crash.
Kevin Wong is the Director of Soul Legal and a seasoned Perth-based personal injury lawyer who has been passionately representing injured clients across Western Australia since 1991, handling everything from minor claims to complex catastrophic injury cases.
