This article addresses a growing category of insured motorists who discover—often too late—that “right,” “wrong,” and “fairness” in motor insurance repudiations are not always applied with the clarity one would expect. It is written for policyholders whose claims are rejected on the basis that they allegedly exceeded the speed limit, failed to take reasonable care, or otherwise breached their contractual duty to minimise risk or loss.
After more than seventeen years of investigating, analysing, reconstructing, and testifying in road traffic matters before courts at all levels, a consistent trend has emerged. Historically, repudiations were largely confined to cases of demonstrable extreme negligence or clear intoxication. Increasingly, however, repudiation is justified on far more tenuous grounds—most notably alleged speeding derived from questionable expert analysis.
In recent years, a growing number of motorists have approached me with accounts that follow a strikingly similar pattern. They are involved in a collision, submit a claim, and are informed that an “expert” has been appointed. That expert produces a report concluding that the insured vehicle was travelling at an excessive speed. On that basis alone, the insurer repudiates the claim, alleging a failure to take due care and characterising the conduct as reckless or negligent, thereby constituting a material breach of policy conditions.
In one representative matter, a policyholder was asked to attend an interview with his insurer following a collision caused by another driver. Believing that transparency was in his best interests, he cooperated fully. During questioning, he admitted to having consumed a single beer earlier in the evening. Despite the absence of any evidence of impairment, intoxication, or causal contribution, his claim was repudiated on the basis that he had admitted to being “under the influence of a drug,” constituting a material breach. The claim was never paid.
Speed-based repudiations have since become increasingly prevalent. In another matter, a collision occurred during intense rainfall. Even before the investigation commenced, the insured was warned that the claim would be scrutinised because of the value of the other vehicle involved. An expert report followed, containing limited scene work, selective measurements, and a single mathematical speed calculation. On that calculation alone, the claim was repudiated.
When a claim is repudiated in South Africa, the insured may approach the Ombudsman for Short-Term Insurance (OSTI). In theory, this provides an accessible and cost-effective remedy. In practice, however, the process places significant procedural and financial pressure on the insured. Once the insurer submits its expert report, the complainant is often afforded only days to respond. Meaningful rebuttal typically requires the appointment of an independent expert, scene inspection, vehicle examination, and technical review of the insurer’s report—often under unrealistic time constraints.
In one such case, multiple supplementary expert reports were produced by or on behalf of the insurer after material errors were identified. Each subsequent report purported to correct deficiencies in the previous one, yet continued to assert excessive speed while failing to answer fundamental methodological questions. Ultimately, the OSTI closed the matter without resolution, leaving the insured without compensation and forcing consideration of litigation. The reports relied upon remained technically and scientifically indefensible.
Once legal proceedings are instituted, OSTI jurisdiction falls away. The insured is then exposed to prolonged litigation, significant legal and expert costs, and years of uncertainty. In one Pretoria matter, a claim repudiated on the basis of a single-formula speed calculation has remained unresolved for more than three years, with the insured bearing the ongoing financial burden of replacement vehicles, insurance premiums, and legal fees.
A concerning pattern has emerged. The same small group of experts appears repeatedly across repudiation matters, appointed by different insurers, applying the same simplified speed formula regardless of collision dynamics. Whether the vehicle left the roadway, rolled, struck a fixed object, or traversed multiple surfaces, the analytical approach remains unchanged. This uniformity is not a sign of scientific consistency; it is a red flag.
Speed has become the “silver bullet” of motor claim repudiation.
The problem is not the existence of mathematical models for speed determination. The problem lies in their misuse. Basic motion equations are precisely that—basic. Authoritative texts, including the Northwestern University Accident Reconstruction Manual, explicitly caution that such equations are intended for instructional purposes and require strict preconditions. They are not designed to be applied in isolation to complex, real-world collision dynamics.
A speed calculation is only as reliable as its input values. For a basic skid-to-stop calculation to be valid, several conditions must be satisfied. The distance of deceleration must be accurately established along the vehicle’s actual path of motion. The vehicle must decelerate over a single surface with known characteristics. The number of wheels braking or skidding must be determinable. The vehicle must not collide with other objects during deceleration. The drag factor must be derived from testing or from properly referenced ranges, not selected arbitrarily to inflate results.
In practice, these conditions are rarely met. Vehicles frequently traverse multiple surfaces, yaw, rotate, roll, or strike objects. ABS systems prevent continuous visible skid marks. Environmental conditions vary. Despite this, a single distance and a single drag factor are often assumed, producing a deceptively precise but fundamentally unreliable speed value.
The Society of Automotive Engineers has long recognised these limitations. SAE research, including SAE 830621, makes it clear that drag factors vary with surface type, surface condition, vehicle speed, and braking configuration. Where testing is not performed, ranges must be applied, and uncertainty must be acknowledged. Failure to do so is not a minor oversight; it is a methodological flaw.
From a legal perspective, expert evidence must meet standards of relevance, reliability, and methodological soundness. In South Africa, courts have repeatedly emphasised that expert opinion must be properly reasoned and scientifically grounded. Unsupported assumptions and ipse dixit conclusions carry little weight. In the United States, similar principles apply under standards such as Daubert, where courts scrutinise the reliability of expert methods and their application to the facts.
What, then, should an insured do when faced with a speed-based repudiation?
First, obtain the full expert report relied upon by the insurer. Do not accept summaries or conclusions. Second, recognise that you cannot effectively challenge technical evidence without independent expertise. An opposing expert is not a luxury; it is a necessity. Third, act early. Evidence degrades quickly. Scene conditions change, vehicles are repaired or disposed of, and critical data is lost.
If the OSTI route is pursued, understand its procedural limits and timelines. It can be effective, but only if the response is technically robust and timely. If litigation is contemplated, be aware of the costs, delays, and risks involved. In either case, the quality of the evidence gathered early will largely determine the outcome.
In many instances, the cost of engaging an independent expert promptly is far less than the long-term financial and legal consequences of an unjustified repudiation. Education and preparation—whether through basic accident investigation training or access to authoritative reference material—can significantly reduce vulnerability.
Motor claim repudiation based on alleged speeding is not inherently unjustified. It becomes unjustified when it rests on flawed methodology, unsupported assumptions, and a failure to account for real-world collision dynamics. Speed calculations are tools, not truths. When misused, they distort rather than illuminate.
Policyholders are entitled to fair treatment. Insurers are entitled to investigate. Courts and ombudsman processes exist to adjudicate disputes. But none of these mechanisms function properly when critical scientific scrutiny is absent. The question is not whether a formula exists, but whether it was applied correctly, transparently, and honestly.
That is where most repudiations fail.
