In Türkiye, driving under the influence of alcohol is strictly prohibited beyond certain legal limits, as regulated by the Highway Traffic Law and related legislation. When a driver involved in a traffic accident is found to be over the legal blood alcohol content limit, insurance companies frequently attempt to exclude the resulting damage from coverage, and may also seek to recover any payments made from the insured through a recourse claim.
Quick Answer: Under settled Court of Cassation jurisprudence, a driver's blood alcohol content being over the legal limit does not, by itself, allow an insurer to deny coverage or seek recourse against the insured. The insurer must prove that the accident occurred exclusively because of the alcohol, established through a detailed expert report, and the burden of proving that a risk falls outside coverage rests with the insurer under Article 1409 of the Turkish Commercial Code. Where causation between the intoxication and the accident is not established, the insurer remains liable to pay.
Under Article 48 of the Highway Traffic Law, Law No. 2918, it is forbidden for individuals who have consumed alcohol to the extent that it impairs their ability to drive safely to operate a motor vehicle. The Highway Traffic Regulation, specifically Article 97, further clarifies the applicable thresholds by vehicle category.
The commonly cited figure of 0.50 per mille applies to drivers of private passenger vehicles. A stricter threshold of 0.20 per mille applies to drivers of commercial vehicles, public transport vehicles, and drivers still within their probationary licence period, reflecting the higher duty of care expected of professional and novice drivers. Exceeding the applicable threshold results in administrative penalties, including a fine, a period during which the vehicle is barred from traffic, and, depending on the reading and whether it is a repeat offence, a temporary confiscation of the driving licence for a period set out in the regulation. Readings significantly above these thresholds can also expose the driver to criminal liability for endangering traffic safety under the Turkish Penal Code, separate from the administrative and insurance consequences discussed in this article. Exceeding the applicable limit can also lead to further administrative penalties and, in some cases, reasons your driver license can be confiscated.
Alcohol level is typically measured at the roadside using a breath testing device, with the result recorded on the official accident or traffic stop report. A driver who disputes the breath test result is generally entitled to request a blood test at a health facility, and Turkish practice recognises that blood alcohol content declines over time, so the regulation provides a mechanism for adjusting the later reading to account for the interval between the roadside test and the health facility test. Because this adjustment can meaningfully change whether a driver was over or under the applicable threshold at the time of the accident, the procedural correctness of how the test was conducted and recorded is often just as important to a later insurance dispute as the substantive causation question addressed in section 3.
The same statutory framework that prohibits alcohol impaired driving also prohibits driving under the influence of narcotic or stimulant substances, and the exclusion clause discussed in section 2.1 below is typically drafted to cover both categories together. The causation standard developed by the Court of Cassation for alcohol related disputes, requiring proof that the impairment was the exclusive cause of the accident rather than merely present, is generally applied on the same basis where the dispute instead concerns a narcotic substance, since the underlying legal principle, that the insurer bears the burden of proving exclusive causation, does not depend on which impairing substance is involved.
Insurance companies often rely on the General Conditions applicable to Compulsory Traffic Liability Insurance, commonly cited as Clause B.4.d, which allows insurers to deny coverage or seek recourse against the insured where the accident occurred while the driver was under the influence of alcohol or narcotics, and the impairment caused the accident. Both conditions in that sentence matter: the clause is not triggered by intoxication alone, but by intoxication combined with a proven causal link to the accident.
It is worth distinguishing two different insurance contexts that both raise this issue in practice. Compulsory Traffic Liability Insurance, which every registered vehicle in Türkiye must carry, protects third parties injured or whose property is damaged by the insured vehicle; where the insurer pays a third party and then seeks to recover that payment from its own insured on the grounds of alcohol related fault, this is a recourse, or rücu, claim. Kasko, Türkiye's optional comprehensive or collision coverage for the insured's own vehicle, raises a related but distinct question: whether the insurer can deny a claim for damage to the insured's own vehicle on the same alcohol related grounds. Turkish courts, including the Court of Cassation, have applied the same underlying causation standard to both contexts, but the two claims run through different procedural tracks and should not be treated as interchangeable when a specific dispute is being assessed.
Turkish courts, including the Court of Cassation, consistently rule that being over the legal blood alcohol content limit does not automatically mean the accident was caused by alcohol. There must be clear causation, meaning a direct and, in the language used by the Court of Cassation, exclusive connection between the intoxication and the accident. This standard has significant practical consequences. Where another driver's violation, a road defect, a mechanical failure, or an unavoidable hazard contributed materially to the accident, the fact that the insured driver was over the legal alcohol limit does not, on its own, establish the exclusive causation the insurer needs to deny coverage or succeed in a recourse claim. Fault attributable to the other party involved in the accident is one of the clearest ways this causal chain can be broken, since it shows the accident was not exclusively the product of the insured driver's intoxication.
Two contrasting scenarios illustrate how this standard tends to be applied in practice. Where an intoxicated driver, travelling well above the speed limit at night, drifts out of their lane and collides head on with oncoming traffic, with no contributing conduct from the other driver and no adverse road or weather conditions, the causal link between the intoxication and the accident is generally treated as strong. Where, by contrast, an intoxicated driver proceeding at a reasonable speed within their own lane is struck by another vehicle that failed to yield at an intersection, the accident is more plausibly attributed to the other driver's violation than to the insured driver's intoxication, even though the insured driver was still over the legal limit at the time. Courts have repeatedly declined to treat the second type of scenario as sufficient grounds for denying coverage or pursuing recourse, precisely because the intoxication was not shown to be the exclusive cause.
The presence of alcohol in the driver's system is not sufficient to exclude insurance coverage unless it can be proven that the accident was caused solely by intoxication. Courts require a detailed expert report from a panel typically composed of a traffic accident reconstruction expert, a legal expert, and a neurology specialist. This composition is not arbitrary: the reconstruction expert establishes the physical mechanics of the accident, the neurology specialist addresses how the measured blood alcohol level would plausibly have affected the driver's reaction time and judgment at the relevant moment, and the legal expert situates these technical findings within the causation standard the courts apply. The panel must evaluate whether the accident occurred solely due to alcohol, or whether other factors, such as road conditions, weather, or the conduct of another driver, played a contributing role. Where a panel's report addresses only the blood alcohol reading without engaging with these other factors, Turkish courts have generally found the report insufficient to support a denial of coverage.
Securing and, where necessary, challenging the official accident report is often a decisive part of this process, since the reconstruction expert's findings typically rely heavily on the record made at the scene. For more on this step, see our guide to accident report forms in Turkey.
The court held that a blood alcohol content over 0.50 per mille does not, by itself, justify denial of coverage. It emphasised that the insurer must prove the accident occurred exclusively due to alcohol, and it further noted that the regulatory threshold itself needed to be properly connected to its statutory basis in order to be applied.
This decision reiterated that insurers must prove the accident occurred solely because of intoxication. Merely being under the influence is insufficient on its own, and courts must consult an expert panel before denying a claim on this ground.
This decision emphasised that the insurer must prove the accident was exclusively due to alcohol. The presence or absence of fault by other drivers involved in the accident was treated as relevant to this determination, since fault attributable to another party undermines the claim that the insured driver's intoxication was the sole and exclusive cause.
What is notable across these decisions, spanning more than a decade of Court of Cassation jurisprudence, is how consistently the same standard is applied regardless of the specific chamber deciding the case or the precise procedural posture of the claim. Whether the dispute involves a third party recourse claim under compulsory traffic insurance or a first party denial under a kasko policy, the exclusive causation requirement and the expectation of a properly reasoned expert report have remained the settled approach.
The Court of Cassation's jurisprudence in this area rests on a general principle of Turkish insurance law: the insurer bears the burden of proving that a risk falls outside the scope of coverage. This principle is codified in the current Turkish Commercial Code, Law No. 6102, at Article 1409, which places the burden of proving that a risk is excluded from coverage on the insurer rather than on the insured. Older commentary and some earlier case law refer to the equivalent provision under the previous Turkish Commercial Code, Law No. 6762, which is no longer in force; that earlier statute's numbering should not be relied upon when citing current law, since Article 1409 of Law No. 6102 is the applicable provision today.
Applied to alcohol related disputes, this means the insurer, not the insured driver, must affirmatively establish both that the driver was intoxicated beyond the applicable legal threshold and that the intoxication was the exclusive cause of the accident. An insured driver facing a denial of coverage or a recourse demand is not required to disprove causation; the burden sits with the party seeking to avoid or recover payment.
This distinction matters in practice more than it might first appear. Because the burden sits with the insurer, a driver who receives a denial letter or a recourse demand that simply states the blood alcohol reading and cites the exclusion clause, without a supporting expert report addressing causation, is generally in a strong position to challenge that denial, since the insurer has not yet discharged the burden the law places on it. Waiting to see whether the insurer produces a properly reasoned report, rather than assuming the denial is final, is often the more effective first response.
Taken together, this settled jurisprudence makes several points clear for an insured driver facing an alcohol related coverage dispute:
An insured driver who believes a claim has been wrongly denied, or who is facing a recourse demand that does not appear to rest on a properly reasoned expert finding, should request and review the full expert panel report rather than accepting the insurer's characterisation of it. Where the underlying accident also resulted in an administrative fine, there may separately be grounds to object to related administrative fines arising from the same incident, and this objection runs on its own procedural track rather than automatically following from success in the insurance dispute.
Where a driver has been involved in an accident and there is any dispute about alcohol involvement, several practical steps tend to matter most for preserving a later insurance claim. Requesting a copy of the official accident report and the results of any breath or blood alcohol testing at the time, rather than relying on a summary provided later by the insurer, is an important first step, since discrepancies in how the testing was conducted or recorded are a common basis for challenging the insurer's position. Where the insurer commissions its own expert panel, the insured is generally entitled to review that report and, where it appears incomplete or fails to address contributing factors such as road conditions or the conduct of another party, to challenge its conclusions before a court rather than simply accepting a denial of coverage or recourse letter at face value.
It is also worth keeping timelines in mind. Insurance claims and recourse actions in Türkiye are subject to their own limitation periods, and a driver who delays too long in responding to a denial or in initiating a court challenge can lose the ability to contest it regardless of how strong the underlying causation argument might have been. Where a driver disagrees with a denial or a recourse demand, engaging with the dispute promptly, rather than after the relevant limitation period has run, preserves options that might otherwise be foreclosed.
Under Turkish law, the presence of alcohol in a driver's system does not, by itself, release an insurer from liability, whether the dispute concerns a third party recourse claim under compulsory traffic insurance or a first party denial under a kasko policy. The Court of Cassation has consistently required proof of exclusive causation, supported by a properly composed expert report, before an insurer can rely on intoxication to avoid payment, and the burden of establishing that causation rests squarely on the insurer under Article 1409 of the current Turkish Commercial Code. Legal representation from our team can help policyholders facing motor insurance disputes involving alleged alcohol related exclusions ensure that their rights are protected and that any denial or recourse demand is properly supported by the evidence the law requires.
The limit is 0.50 per mille for drivers of private passenger vehicles. A stricter limit of 0.20 per mille applies to commercial and public transport drivers and to drivers within their probationary licence period.
No. Under settled Court of Cassation jurisprudence, the insurer must prove that the accident occurred exclusively because of the alcohol, not merely that the driver was over the legal limit at the time of the accident.
The insurer. Article 1409 of the Turkish Commercial Code, Law No. 6102, places the burden of proving that a risk falls outside coverage on the insurer, not on the insured driver.
Courts typically require a report from a panel including a traffic accident reconstruction expert, a legal expert, and a neurology specialist, evaluating whether the accident occurred solely due to alcohol or whether other factors contributed.
Yes. Turkish courts have applied the same exclusive causation requirement to both compulsory traffic liability insurance recourse claims and kasko coverage denials, though the two run through different procedural tracks.
Yes. Fault attributable to another party involved in the accident is relevant to whether the insured driver's intoxication was the exclusive cause, and can defeat an insurer's attempt to deny coverage or pursue recourse on that basis.
It is the exclusion clause commonly found in the General Conditions for Compulsory Traffic Liability Insurance, allowing the insurer to deny coverage or seek recourse where the accident occurred under the influence of alcohol or narcotics and the impairment caused the accident. Both elements, the impairment and the causal link, must be established.
No. Turkish courts have consistently found that a blood alcohol reading alone, without a properly reasoned expert report addressing exclusive causation, is insufficient to support a denial of coverage or a recourse claim.
Request the full expert panel report and the underlying accident documentation rather than accepting the insurer's summary, and have the report reviewed to confirm it properly addresses exclusive causation and any contributing factors before accepting the denial.
Yes. An administrative fine for exceeding the legal alcohol limit is handled on a separate procedural track from an insurance coverage dispute, and a driver may have independent grounds to object to that fine regardless of the outcome of the insurance claim.
Yes. Private passenger vehicle drivers are subject to a 0.50 per mille limit, while commercial vehicle drivers, public transport drivers, and probationary licence holders are held to a stricter 0.20 per mille limit.
Confiscation follows its own administrative procedure separate from any insurance dispute, and the applicable grounds and process are addressed in our guide on when a driver licence can be confiscated in Turkey.
Yes. Insurance claims and recourse actions in Türkiye are subject to their own limitation periods, so a driver who wishes to contest a denial or a recourse demand should engage with the dispute promptly rather than delaying.
Generally yes. The underlying principle that the insurer must prove exclusive causation, and bears the burden of doing so, applies on the same basis regardless of whether the impairing substance was alcohol or a narcotic.
