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T-bone side impact collisions: How SIRA defines claims under NSW CTP

This article explains how SIRA defines T-bone side impact collisions under NSW CTP rules, including fault determination, claimable damages, and evidence requirements. It also outlines when to seek legal advice and the importance of acting within time limits.

Current as at 7 October 2026

How SIRA defines T-bone side impact collisions under NSW CTP

A T-bone side impact collision occurs when one vehicle's front end strikes another vehicle's side, typically at an intersection or driveway. SIRA (State Insurance Regulatory Authority) defines this as a specific type of motor accident under the Motor Accident Injuries Act 2017. This type of collision is distinct from head-on or rear-end impacts and has particular rules for determining fault and claim eligibility.

Key legal rules behind T-bone side impact claims

Under NSW CTP rules, fault determination depends on whether the collision fits the T-bone definition. SIRA considers factors such as vehicle positioning, traffic signals, and witness statements. For example, if a car turns left across the path of another vehicle, the turning vehicle is usually deemed at fault unless there are exceptional circumstances.

The Motor Accident Guidelines also clarify that injuries must meet the 'threshold injury' criteria to qualify for benefits. This includes soft tissue injuries like whiplash, provided they meet specific clinical signs outlined in the guidelines. SIRA uses these guidelines to assess whether a claimant is eligible for weekly payments or treatment benefits.

Evidence and practical steps for T-bone claims

To support a T-bone claim, you must document the accident scene, including vehicle positions and any traffic signs. Witness statements and police reports are critical. Medical records must also show a connection between the collision and your injuries. For instance, if you suffered a spinal nerve-root injury with neurological signs, this may still qualify as a 'threshold injury' under SIRA's rules.

If your claim involves a dispute over fault, SIRA may require an independent assessment. It's important to preserve all evidence, as the 52-week statutory benefit period begins once your injuries are confirmed. After this period, weekly payments typically stop unless your condition worsens.

When to seek legal advice

Disputes over fault, injury severity, or benefit calculations often require legal assistance. SIRA provides a free claims process, but complex cases may need a solicitor to challenge decisions or negotiate higher compensation. For example, if your claim is denied due to a disagreement over the type of injury, a lawyer can help you re-evaluate your case using the Motor Accident Injuries Act 2017.

Example: T-bone collision at a driveway

Imagine a scenario where a car turns into a driveway and collides with a stationary vehicle's side. SIRA would assess fault based on whether the turning vehicle had right of way. If the injured party has a confirmed threshold injury, they may receive weekly payments for 52 weeks. However, if the injury worsens after this period, additional benefits may be available.

Next steps for T-bone claimants

Time limits and procedural rules mean it's crucial to act promptly. If your claim is denied or you're unsure about your entitlements, seek advice from a legal professional. Every claim depends on its own facts, and SIRA's rules can be complex. To request contact about your circumstances, complete the quick, no obligation enquiry form.

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