
Australia has strict laws regarding car modifications and vehicle standards. These laws are known as Australian Design Rules (ADR) and regulate the safety, efficacy, and environmental performance of cars. While there are no specific cars that are illegal to drive in Australia, certain modifications are prohibited, and some vehicles may be unable to meet the strict ADR standards. For example, popular car models without autonomous emergency braking (AEB) will be banned from being sold in Australia from March 2025. Additionally, there are restrictions on the power-to-weight ratio for P-platers in certain states, which effectively bans them from driving high-powered vehicles.
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What You'll Learn

High-powered vehicles for P-plate drivers
The rules for P-plate drivers in Australia vary across states. In New South Wales, Queensland, Victoria, and South Australia, there are restrictions on what P-platers are allowed to drive. However, in the Australian Capital Territory (ACT), Northern Territory, Western Australia, and Tasmania, there are no high-powered vehicle restrictions for P-plate drivers.
In New South Wales, Queensland, and Victoria, P-plate drivers are banned from driving vehicles with a power-to-weight ratio of greater than 130 kilowatts per tonne (kW/tonne) or with modified engines that need to be approved by an engineer. This means that some newer vehicles with small-capacity turbocharged engines are allowed, such as the turbocharged Volkswagen Golf 110TSI. Other vehicles, like the 2024 Hyundai i30 N Premium, are considered too powerful for these states due to their power-to-weight ratios.
South Australia has a similar rule for vehicles manufactured after 2010, with a limit of 130 kW/tonne. However, for vehicles manufactured before 2010, the rules are different, and P-plate drivers are banned from driving vehicles with eight cylinders or more, turbocharged or supercharged engines (except diesel), or engines with more than 210 kW. Engine modifications are also restricted, except for factory-approved changes and drop-in air filter replacements.
While there are no specific vehicle restrictions in the ACT, Northern Territory, Western Australia, and Tasmania, insurance companies may have their own restrictions for drivers under 25. Additionally, P-plate drivers in any state may be able to obtain exemptions for certain vehicles if they have special circumstances, such as requiring the vehicle for work purposes.
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Car modifications
Basic and Complex Modifications
Basic modifications include shock absorber substitution, power steering conversion, and like-for-like replacement of engines. These modifications do not require approval or certification, but the vehicle must continue to meet all applicable vehicle standards. Complex modifications, on the other hand, include engine upgrades, suspension upgrades, mass re-rating, gearbox changes, vehicle body modifications, and steering and brake replacements. These significant modifications can affect the safety of the vehicle if not performed properly and must comply with specific requirements.
State-Specific Regulations
It is important to note that each Australian state and territory has its own set of regulations. For example, in New South Wales (NSW), car modifications are regulated by the Roads and Maritime Services (RMS), while in Victoria, the VicRoads authority oversees car modification laws. Queensland has its own set of requirements, with specific rules for lighting, window tinting, vehicle height adjustments, and performance modifications.
Illegal Modifications
Some modifications that are commonly considered illegal in Australia include:
- Reflective window tint film that is more than 10% reflective, or bubbled/distorted window film that impairs visibility.
- Non-compliant bull bars—bull bars must meet ADR standards to be roadworthy.
- Improperly fitted or overloaded roof racks that exceed the car's weight limit or increase the car's height beyond the legal limit.
- Fitting an aftermarket blow-off valve, which can affect the vehicle's compliance with exhaust emission requirements.
- External wastegates on turbocharged engines.
- Non-compliant exhaust systems—these can result in insurance claims being denied.
- Lowering the suspension or vehicle body too much.
Important Considerations
Before making any modifications, it is essential to research the legal requirements in your specific state or territory. Consulting a mechanic or specialist who understands the rules can help ensure your desired modifications are legal and safe. It is also important to buy parts from reputable stores and ensure any modifications are certified by a licensed engineer or certifier when required. Remember, even minor modifications can have legal implications, so always stay informed and adhere to local laws.
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Bull bars
There are a few key standards that apply nationwide:
- Australian Standard 4876.1 2002 (AS 4876.1): This outlines the specifications for bull bars, including design, materials, and fitting requirements. It ensures that bull bars are safe and do not interfere with a vehicle's essential functions.
- Australian Design Rules (ADR): ADR is a set of national standards governing vehicle safety in Australia. Bull bars must comply with these rules, ensuring they do not hinder the deployment of airbags or affect crumple zones in a collision.
- Head Impact Criteria (HIC): HIC measures the potential injury to a pedestrian's head during a collision.
It's important to note that laws can vary across states and territories. For example, rod holders on bull bars were banned retrospectively in some states due to the risk they pose to pedestrians. Additionally, while a bull bar may have been legal when a vehicle was new, it may not comply with updated standards. As such, it is essential to stay informed about the relevant laws and standards to ensure any bull bar you purchase and fit is safe and legal.
Now, regarding your initial query about illegal cars in Australia, there are no specific models or makes that are inherently illegal. However, certain restrictions apply to P-plate drivers in Queensland, NSW, Victoria, and South Australia. These restrictions are based on power-to-weight ratios, with a limit of 130kW per tonne of tare weight power-to-weight ratio. Some states also have banned lists of vehicles for P-plate drivers. Additionally, insurance companies may have their own restrictions for drivers under 25.
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Roof racks
In Australia, it is not illegal to strap loads to the roof of your car, as long as the load is properly restrained and evenly distributed across the roof. However, there are regulations and limits on the length of loads that are longer than the vehicle. These regulations vary across states and territories, so it is important to check the specific requirements of your location.
It is worth noting that elastic straps and hockey straps are not recommended for securing loads on the roof of a vehicle. Additionally, when carrying a ladder, it is crucial to ensure that it does not exceed the allowable length for projecting or overhanging loads specified by your local state or territory roads and transport authority.
In general, the front and rear overhang from roof racks should not exceed 1.2 metres. If the load extends beyond this limit, Australian law requires the use of warning gear, such as a red, yellow, or fluorescent flag during daylight hours, or a red light during low-visibility conditions. Failure to comply with these regulations can result in fines or demerit points, and you may be held liable in the event of an accident.
To ensure compliance with the regulations, it is recommended to use a tape measure to check the length of the load and to familiarise yourself with the allowable limits in your specific state or territory. Additionally, it is important to regularly inspect your roof rack and load to ensure that everything is secure and within the legal limits.
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Australian Design Rule (ADR) non-compliance
The Australian Design Rules (ADRs) are Australia's national technical regulations for vehicle safety, theft resistance, and emissions. All new road vehicles manufactured in Australia and imported new or second-hand vehicles must comply with the relevant ADRs when they are first supplied to the Australian market. The relevant state or territory government legislation generally requires that vehicles comply with the relevant ADRs as at the time of manufacture.
The ADRs are largely based on and actively harmonized with the UN vehicle and equipment regulations. An ADR may directly specify technical and performance requirements, as well as allow alternative standards to be met instead. The alternative standards are typically the same UNECE regulations as those directly specified. Most ADRs have been fully harmonized with UNECE regulations, meaning that a manufacturer only needs to provide evidence of a UNECE approval or a valid test to the requirements of a regulation to demonstrate compliance.
Those ADRs that are only partially harmonized with UNECE Regulations require additional Australian requirements to also be met. Where an ADR is harmonized, the base text of the UNECE regulation forms the main text of the ADR. The ADRs use only the technical requirements of the ECE Regulations; the ECE system of type approval is not used. Instead, the ADRs are administered according to a self-certification system like that of the United States: manufacturers do not seek government-sanctioned testing or homologation; rather, they certify that their vehicles and regulated vehicle components comply with all applicable provisions of all applicable ADRs in effect on the date of manufacture. On vehicles, this certification is made by dint of the manufacturer affixing a "compliance plate" stating the vehicle's specifications and parameters, build date, identification number, and other required information along with a statement to the effect that the vehicle complies with all applicable standards.
Vehicles configured according to the regulations of countries other than Australia are generally barred from import to Australia unless they are brought into compliance with applicable ADRs and the conversion work is inspected and certified by an authorized compliance engineer. As of 2024, the standards are the Third Edition ADRs, introduced in July 1989. Since 1 July 2021, they have been administered by The Department of Infrastructure, Transport, Regional Development, Communications and the Arts under the Road Vehicle Standards Act 2018 (RVSA).
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Frequently asked questions
In Queensland, NSW, Victoria and South Australia, you can't drive a car with more than 130kW per tonne of tare weight power-to-weight ratio. In NSW, anything with 130kW/tonne or above is banned, along with some cars considered high-risk for novice drivers. In South Australia, no high-powered vehicles can be driven by P-platers under 25.
Yes, several car modifications are illegal in Australia. These include:
- Wheel spacers (unless they're factory-fitted)
- Ultra-bright HID or LED headlight kits (unless they're factory-fitted)
- Underglow lights
- Lifting your car's suspension too high without the proper approvals
- Fitting bigger tyres without ensuring they're the right size
- Bull bars that don't meet ADR (Australian Design Rules) standards
- Non-compliant roof racks
- Non-compliant mudguards
Yes, certain car models without AEB (autonomous emergency braking) will be banned from being sold in Australia starting in March 2025. This includes models such as the Suzuki Ignis, Aston Martin DB11 and DBS, Lamborghini Aventador and Huracan, and some Porsche 718 versions.
Yes, importing cars into Australia is subject to various regulations and standards, including the Australian Design Rules (ADR) and emission control requirements. For example, vehicles equipped to operate on dual fuel must retain original emission control equipment and comply with petrol-related regulations.
While there is no explicit age restriction, there are laws in place that restrict the power-to-weight ratio of high-performance vehicles, especially for P-plate drivers. These laws vary by state and the age of the vehicle.







































