Heavy commercial vehicle (“HCV”) accidents occupy a distinctive and demanding corner of motor vehicle litigation. While the governing principles of negligence are familiar, the context in which they operate is materially different. The size and mass of the vehicles involved, the regulatory environment in which they operate, the frequency of catastrophic injuries, and the layered insurance structures that follow all combine to produce cases that are more complex, more expensive, and from my experience often more difficult to resolve than ordinary passenger-vehicle claims.

As with motorcycle accidents, heavy commercial vehicle claims require counsel to resist oversimplified liability narratives. These cases reward early discipline, technical fluency, and a clear understanding of how risk is ultimately allocated, not just between parties, but between insurers.

 The Nature of Heavy Commercial Vehicle Claims

Heavy commercial vehicles are not simply “bigger cars.” Tractor-trailers, dump trucks, concrete mixers, and other large commercial units operate with vastly different stopping distances, turning radii, blind spots, and mechanical demands. When collisions occur, the physical consequences are often disproportionate. Even relatively low-speed impacts can result in devastating injury to occupants of smaller vehicles.

Despite these realities, Canadian courts have consistently applied orthodox negligence principles to HCV cases. In Ottawa Brick & Terra Cotta Co. Ltd. v. Marsh, 1940 CanLII 4 (SCC), [1940] SCR 392^[1], the Supreme Court of Canada considered a nighttime collision involving two motor trucks travelling on a provincial highway. The dispute turned on issues such as lane position, visibility, and whether either driver failed to maintain proper lookout and control. The Court’s analysis reaffirmed that commercial drivers are assessed against the same standard of reasonable care, applied contextually to the circumstances in which they operate.

What distinguishes modern heavy commercial vehicle litigation is not a different legal test, but the breadth of factual material required to apply it. Logbooks, inspection records, maintenance histories, training protocols, and mechanical data often become central to the liability analysis.

Multi-Vehicle Collisions and Expanding Liability

Heavy commercial vehicles are frequently involved in multi-vehicle accidents, particularly on highways and major arterial roads. Chain-reaction collisions, lane-change incidents, and rear-end impacts involving trucks often result in complex liability scenarios.

In Sterling Trusts Corpn. v. Postma et al., 1964 CanLII 24 (SCC), [1965] SCR 324^[2], the court dealt with a collision involving a truck and two passenger vehicles. Although the factual matrix was not elaborate, the case illustrates a persistent principle in commercial vehicle litigation, that  where multiple drivers contribute to an accident, liability may be apportioned among them, and joint and several responsibility may follow.

For plaintiffs, this often expands the pool of viable defendants. For insurers, it raises immediate questions about contribution, indemnity, and ultimate exposure, questions that often drive litigation strategy long before trial.

Maintenance, Mechanical Failure, and Systemic Negligence

One of the defining features of heavy commercial vehicle litigation is the frequency with which mechanical failure becomes a live issue. Unlike private vehicles, HCVs operate under structured inspection and maintenance regimes, frequently involving third-party contractors and specialized repair facilities.

The New Brunswick case Ouellette v. Atlantic Bandag (1995), 171 N.B.R.(2d) 119 (TD)^[3] is a clear illustration. The plaintiffs were operating a truck when the right rear dual tires failed, causing the vehicle to overturn. Evidence showed that the tire had been retreaded and repaired by the defendant company. Expert testimony established that the repair was defective and that the failure directly caused the accident. Liability was imposed not on the driver, but on the entity responsible for the negligent repair.

The case demonstrates how heavy commercial vehicle litigation often expands beyond driver error to encompass systemic negligence. Maintenance providers, repair facilities, and component suppliers may all become implicated, transforming what might initially appear to be a straightforward driving case into a technically complex negligence action.

Apportionment of Fault: Size Is Not Liability

A recurring misconception in heavy commercial vehicle claims is that the larger vehicle will necessarily bear greater fault. Canadian courts have consistently rejected this approach.

In McKee and Taylor v. Malenfant and Beetham, 1954 CanLII 15 (SCC), [1954] SCR 651^[4], the Supreme Court of Canada addressed a multi-vehicle accident and emphasized that liability must be apportioned according to each party’s actual departure from the standard of care, assessed on the evidence of how the accident occurred, rather than by reference to the type of vehicle involved.

This principle remains central in modern trucking litigation. Defendants frequently argue that passenger-vehicle drivers failed to appreciate blind spots, braking distances, or turning limitations. Courts assess those arguments carefully, but they do not relieve commercial drivers, or commercial operators, of their own obligations to operate safely in mixed traffic environments.

Insurance Architecture and Loss Transfer

Insurance considerations often dominate heavy commercial vehicle files from the outset. Commercial vehicles typically carry higher third-party liability limits, and statutory schemes governing indemnity between insurers add an additional layer of complexity.

The Supreme Court of Canada’s decision in Unifund Assurance Co. v. Insurance Corp. of British Columbia, 2003 SCC 40 (CanLII), [2003] 2 SCR 63^[5] remains the leading authority on loss transfer in this context. The Court interpreted s. 275 of Ontario’s Insurance Act and confirmed that, where a heavy commercial vehicle is involved, its insurer may be required to indemnify the accident benefits insurer for benefits paid, depending on vehicle classification and the statutory framework.

What makes Unifund particularly significant is that indemnity can arise independently of fault. As a result, insurers must assess exposure not only through the lens of negligence, but through statutory risk allocation. This often produces strategic divergence. Accident benefits insurers may resist compromise where statutory indemnity appears available, while tort insurers may push for early resolution to cap downstream exposure.

The Practical Impact of Loss Transfer on Litigation Strategy

Loss transfer fundamentally reshapes heavy commercial vehicle litigation. It affects reserve setting, settlement posture, and the willingness of insurers to engage meaningfully at mediation.

Where statutory indemnity is in play, accident benefits insurers may view tort litigation as secondary to recovery rights under the Insurance Act.^[6] Conversely, tort insurers may view global settlement as a mechanism to extinguish not only liability exposure, but also loss-transfer risk. I have observed these competing incentives frequently surfacing at mediation and must be managed deliberately.

Understanding this dynamic is critical. Without it, mediations risk stalling not because the parties disagree on liability or damages, but because they are negotiating from fundamentally different risk frameworks.

Mediation Dynamics in Heavy Commercial Vehicle Claims

Mediation in heavy commercial vehicle cases often differs markedly from mediation in standard automobile claims.

First, the decision-makers are different. Commercial defendants frequently attend mediation with senior adjusters, risk managers, or corporate representatives who approach settlement through exposure modeling rather than litigation emotion.

Second, technical evidence plays a central role. As Ouellette illustrates, mechanical causation can displace driver negligence entirely. Even at mediation, parties often preview expert opinions on maintenance practices, component failure, braking systems, or vehicle dynamics.

Third, loss transfer shapes negotiation posture. Accident benefits insurers armed with Unifund may be less flexible on quantum, while tort insurers may prioritize finality over incremental bargaining.

From a mediator’s perspective, progress often depends on reframing the dispute away from binary fault narratives and toward how risk will ultimately be allocated across insurers, regardless of trial outcomes.

Strategic Lessons for Counsel

Heavy commercial vehicle litigation rewards early clarity. Counsel must identify whether the case is fundamentally about driver conduct, mechanical failure, systemic maintenance issues, statutory indemnity, or some combination of all four.

The jurisprudence confirms that while negligence law remains constant, context matters. As Ottawa Brick, Ouellette, and Unifund demonstrate in different ways, these claims demand disciplined evidence gathering, technical fluency, and strategic appreciation of insurance realities.

Like motorcycle cases, heavy commercial vehicle claims resist shortcuts. They punish assumptions, reward preparation, and are often well-suited to informed mediation when the parties appreciate that liability is only part of the story.