Rear-end on a motorway, still not mostly your fault: Cheng v NRMA [2025] NSWPIC 566
Direct answer: no, rear-ending a stopped vehicle on a NSW motorway does not automatically make you wholly or mostly at fault for CTP benefits. In Cheng v Insurance Australia Limited t/as NRMA Insurance [2025] NSWPIC 566, Senior Member Brett Williams rejected that shortcut because the insurer had not proved the accident was caused wholly or mostly by Mr Cheng’s fault.
Direct answer for claimants
The direct answer is no: a rear-end collision on a NSW motorway does not automatically make the injured driver mostly at fault. In Cheng, the Personal Injury Commission found NRMA had not proved Mr Cheng’s accident was caused wholly or mostly by his fault. The decision is useful where the insurer’s reasoning skips over visibility, sudden lane changes, warning lights, reaction time, and the statutory burden of proof.
If your weekly payments or treatment benefits are being stopped after a rear-end crash, compare the insurer’s reasons with the evidence, then use the internal review and Personal Injury Commission pathways promptly.
Evidence map
What must be tested before calling the claimant mostly at fault?
- Road hazardWas a vehicle stopped in the motorway lane, and were hazard lights or other warnings visible?
- Reaction windowDid another vehicle change lanes suddenly, and when could the stopped vehicle first reasonably be seen?
- Proof burdenCan the insurer prove the accident was caused wholly or mostly by the injured driver’s fault under the Act?
This is the visual requirement handed to the image pipeline: create an evidence-and-fault reconstruction module for this route, not a decorative crash image, showing the stopped vehicle, warning-light question, sudden lane change, short reaction window, insurer burden of proof, and internal review/PIC response bundle.
This is a claimant-friendly summary of the decision, not legal advice. The real citation is Cheng v Insurance Australia Limited t/as NRMA Insurance [2025] NSWPIC 566 (21 October 2025). If an insurer is trying to stop your statutory benefits because you hit the rear of another vehicle, this case is a reminder that labels are not enough, the insurer still has to prove the statutory test under the Motor Accident Injuries Act 2017.
What happened in Cheng?
Mr Cheng was injured on the Hume Motorway at Wilton on 1 October 2023. The insurer accepted statutory benefits for the first 52 weeks, then denied benefits after that point on the basis that the accident had been caused wholly by his fault under ss 3.11 and 3.28 of the Motor Accident Injuries Act 2017.
The factual issue was more complicated than a simple rear-end crash. Another vehicle was stationary in the motorway lane. According to the decision, hazard lights were not activated, and the vehicle immediately in front of Mr Cheng changed lanes suddenly, which affected when he could first perceive the stopped vehicle.
The key legal point in plain English
The PIC did not accept that a rear-end impact automatically proved the claimant was wholly or mostly at fault. The insurer carried the burden of proof. It had to persuade the Commission that, on all of the evidence, the accident was caused wholly or mostly by Mr Cheng’s own fault.
Senior Member Williams referred to authorities including Podrebersek, Axiak v Ingram, Allianz v Shuk, and AAI v Evic. One practical takeaway is especially useful for claimants: relative culpability cannot be assessed the way insurers often want unless there are at least two culpable parties in the frame.
Why the insurer lost
- the stopped vehicle was a motorway hazard in the travel lane
- hazard lights were not activated on that stationary vehicle
- the vehicle in front of Mr Cheng changed lanes suddenly, obscuring and then revealing the danger late
- Mr Cheng braked once the hazard became visible
- the evidence did not prove he failed to exercise reasonable care in the circumstances
That combination mattered. The case did not turn on an abstract idea that following drivers are always to blame. It turned on what could actually be seen, when it could be seen, and whether the insurer had proved unreasonable driving by the claimant.
Why Cheng is useful for real disputes
Claimants often receive insurer decisions that feel mechanically reasoned: rear-end crash, therefore fault; fault, therefore benefits stop. Cheng shows why that approach can be wrong. The statutory test is about whether the accident was caused wholly or mostly by the claimant’s fault, not whether the claimant happened to strike the rear of something.
If the hazard was obscured, if another vehicle moved unexpectedly, if a stopped vehicle was left in-lane without proper warning, or if the factual reconstruction is incomplete, the insurer may not be able to prove the high-fault conclusion it wants.
Claimant takeaway
Do not assume a rear-end collision ends the argument. In stopped-vehicle motorway cases, timing, visibility, lane movements, warning lights, and contemporaneous records can completely change the analysis.
How to use Cheng in a NSW CTP mostly-at-fault dispute
Cheng is most useful when an insurer relies on the shape of the crash rather than a complete reconstruction. It does not remove the need to drive with reasonable care, and it does not guarantee benefits in every rear-end collision. It does, however, give claimants a practical way to test whether the insurer has proved the whole statutory conclusion.
- Ask whether the insurer identified the actual negligent act, not just the fact of impact.
- Separate the conduct of the stopped vehicle, any vehicle that changed lanes, and the injured driver’s reaction window.
- Check whether the insurer has evidence about hazard lights, visibility, traffic speed, following distance, and the first moment the danger could reasonably be seen.
- Use the issue early if the insurer proposes to stop statutory benefits under ss 3.11 or 3.28 after the first 52 weeks.
For wider context, see our guides to contributory negligence in NSW CTP claims, CTP claim disputes, and PIC dispute resolution guidelines.
What to gather if you are fighting this issue
- the insurer denial or cessation notice
- police event and any infringement material
- hospital and ambulance records describing the crash mechanism
- photos, dashcam, or witness evidence about the stopped vehicle and lane movements
- your own clear timeline of when the hazard became visible and what you did next
For readers wanting the source decision, AustLII is here: Cheng v Insurance Australia Limited t/as NRMA Insurance [2025] NSWPIC 566.
Trust and compliance notes
- This route has a deliberately narrow intent: it explains one PIC case note about rear-end motorway fault reasoning, not the whole law of contributory negligence.
- Reviewed against the AustLII decision, ss 3.11 and 3.28 of the Motor Accident Injuries Act 2017, SIRA guidance, and the NSW Personal Injury Commission context on 9 May 2026.
- General information only. The outcome can change if the evidence shows speeding, distraction, unsafe following distance, clear warning lights, or a longer reaction window.
Official references used for this note
Use the source decision together with the official NSW CTP framework. The links below are general official references, not a substitute for advice on your facts.
- Motor Accident Injuries Act 2017 (NSW) for the statutory benefits and fault provisions discussed in the decision.
- SIRA Motor Accident Guidelines for current NSW CTP claims-handling and benefits guidance.
- Personal Injury Commission for the NSW motor accident dispute forum.
Frequently asked questions
- What was decided in Cheng v Insurance Australia Limited t/as NRMA Insurance [2025] NSWPIC 566?
- The PIC decided the 1 October 2023 motorway accident was not caused wholly or mostly by Mr Cheng’s fault for the purposes of ss 3.11 and 3.28 of the Motor Accident Injuries Act 2017. That meant the insurer could not rely on those sections to stop statutory benefits after 52 weeks.
- Why was this decision important for claimants?
- It shows that a rear-end collision does not automatically mean the following driver was mostly at fault. The insurer still had to prove contributory negligence for the motor accident itself, and the Member found the evidence did not establish that here.
- What facts helped Mr Cheng?
- The decision focused on the stationary vehicle being in the motorway lane, hazard lights not being activated, the vehicle ahead changing lanes suddenly, and Mr Cheng having only a short time to perceive and react to the danger.
- Does Cheng mean every rear-end motorway crash is winnable?
- No. Each case still turns on its own facts, road conditions, distances, speed, visibility, and available evidence. Cheng is useful because it shows the insurer carries the burden of proving the claimant was wholly or mostly at fault.
- What should I do if an insurer says I rear-ended a stopped vehicle so I must be mostly at fault?
- Act quickly. Preserve the factual sequence, obtain police and hospital material, identify any sudden lane changes or visibility issues, and use internal review and the correct PIC pathway before the evidence goes stale.