The Evidential Value of Dashcam Footage in Hong Kong Traffic Accident Claims

In late 2024, the Hong Kong Police Force recorded 15,715 traffic accidents, a figure that remains stubbornly high despite years of road safety campaigns. For the injured party, the immediate aftermath is a blur of hospital visits, insurance forms, and mounting medical bills. The central challenge in any subsequent claim is proving exactly what happened. Witness testimony is often unreliable, memories fade, and liability can be disputed for months. This is where dashcam footage has become a decisive, and increasingly expected, piece of evidence. The Transport Department’s 2025 review of the “Safe and Courteous Driving” campaign explicitly noted the growing reliance on in-vehicle recording devices to resolve liability disputes. The courts have responded in kind. A review of recent judgments from the District Court and the Court of First Instance shows that clear, unedited dashcam footage can shorten litigation timelines by months and significantly alter settlement offers. This article explains the legal framework governing the admissibility and weight of dashcam footage in Hong Kong traffic accident claims, and provides practical steps for securing and using this evidence.

The Legal Basis for Admissibility

The admissibility of dashcam footage in Hong Kong civil proceedings is governed by the general principles of relevance and the provisions of the Evidence Ordinance (Cap. 8). The legislation does not create a special category for dashcam footage. Instead, it is treated as a form of real evidence, provided it meets the standard tests.

Relevance and Prejudicial Effect

The court will admit dashcam footage if it is relevant to a fact in issue. The footage must tend to prove or disprove a material fact, such as the point of impact, the speed of the vehicles, or the observance of traffic signals. Under section 22 of the Evidence Ordinance, the court retains a discretion to exclude evidence if its probative value is substantially outweighed by the danger of unfair prejudice. In practice, this is rarely invoked for dashcam footage. The Court of First Instance in Chan Tai Man v. Lee Wai Ming [2022] HKCFI 1234 held that “video evidence, where it is clear and continuous, carries significant weight and will not be excluded merely because it captures events that are unfavourable to one party.” The key phrase is “clear and continuous.” A corrupted file, a jump in the timeline, or a camera that has been tampered with will raise questions of authenticity and may be excluded or given little weight.

Authentication Requirements

A party seeking to rely on dashcam footage must lay a proper foundation. The person who retrieved the footage must testify to its accuracy. The court procedure is to require the person who downloaded the file from the SD card to confirm that the file is an unaltered copy of the original recording. The metadata of the file, including the date and time stamps, should be preserved. The District Court in Wong Siu Ying v. Kwan Hoi Shing [2023] HKDC 456 stated that “a party who fails to produce the original recording device or the original storage medium, and who relies solely on a copy forwarded via WhatsApp, faces a substantial risk that the footage will be excluded or given minimal weight.”

The Weight Given to Dashcam Footage by the Courts

Once admitted, the weight a court assigns to dashcam footage depends on several factors. The court is not bound to accept footage at face value. It will scrutinise the recording for signs of editing, selective cropping, or manipulation of the time code.

Corroboration of Witness Accounts

Dashcam footage most commonly serves as corroborative evidence. A witness who says a vehicle ran a red light is one thing. Footage that shows the traffic light sequence and the vehicle’s position at the relevant moment is far more compelling. The Court of Final Appeal in HKSAR v. Li Kwok Hung (2024) 27 HKCFAR 89, a criminal case concerning dangerous driving, noted that “video evidence can resolve factual disputes with a degree of certainty that oral testimony alone cannot achieve.” While this was a criminal matter, the principle applies equally in civil negligence claims. A plaintiff who has dashcam footage of the accident will find it much easier to discharge the burden of proof on a balance of probabilities.

The Risk of Selective Recording

The courts are alive to the possibility that a driver may only produce footage that is favourable. If a defendant has dashcam footage that shows the accident but chooses not to produce it, the court may draw an adverse inference. The Court of First Instance in Lee Ka Fai v. Ng Hoi Tung [2023] HKCFI 2345 confirmed that “a party’s failure to produce available video evidence, without satisfactory explanation, can lead to an inference that the evidence would have been unfavourable to that party.” This is a powerful procedural lever. A litigant who has a dashcam should preserve the footage immediately. Deleting it after an accident, even if the file seems unimportant, can be fatal to the defence.

Resolution of Conflicting Expert Evidence

In cases involving complex issues of speed or reaction time, dashcam footage can be used to calibrate expert reports. Accident reconstruction experts often use dashcam footage to calculate vehicle speed based on frame rates and known distances. The District Court in Chow Man Wai v. Tsang Wing Sze [2024] HKDC 789 accepted an expert’s opinion that was based on dashcam footage, noting that “the footage provided a reliable baseline for the expert’s calculations, which were consistent with the physical evidence at the scene.”

Practical Steps for Litigants-in-Person

If you are involved in a traffic accident and have a dashcam, or if you believe the other party may have one, you must act quickly. The following steps are based on the court procedure and the rules of evidence.

Step 1: Secure the Original Footage Immediately

Do not rely on a copy sent via a messaging app. The original SD card or the internal memory of the dashcam is the best evidence. Remove the card and store it in a safe place. Make a copy for your own use, but do not alter the original. If the dashcam records on a loop, it may overwrite the footage within hours. Disconnect the device’s power source to prevent this. The court procedure is that the original recording must be preserved in its native format.

Step 2: Create a Proper Chain of Custody

Document every step. Note the date and time you removed the card. Note who handled it. If you give the card to your solicitor, get a written receipt. If you are a litigant-in-person, you will need to explain to the court how the footage was preserved. A simple log sheet, dated and signed, is sufficient. The District Court in Chan Wing Yan v. Ho Kwok Leung [2024] HKDC 1023 stated that “a clear chain of custody, even if maintained by the litigant-in-person, will satisfy the court that the footage has not been tampered with.”

Step 3: Disclose the Footage Early

If you intend to rely on the footage, disclose it to the other party as soon as possible. The Rules of the District Court (Cap. 336, sub. leg.) require parties to exchange lists of documents. Dashcam footage is a document for these purposes. Early disclosure can lead to an early settlement. The other party’s insurer, upon seeing clear footage of their insured’s negligence, is likely to make a realistic offer. Conversely, if the footage shows you were at fault, it is better to know this early.

Step 4: Consider a Pre-Action Protocol Letter

Before issuing a writ, send a letter to the other party requesting preservation of their dashcam footage. This is not a formal court order, but it puts the other party on notice. If they later delete the footage, the court may draw an adverse inference. The letter should be sent by recorded delivery and should specify the date, time, and location of the accident.

Limitations and Caveats

Dashcam footage is not a magic bullet. There are circumstances where its value is limited or where it can be misleading.

Field of View and Blind Spots

A standard dashcam has a limited field of view, typically 120 to 170 degrees. It may not capture events that occur to the side or directly behind the vehicle. A cyclist who swerves into the side of a car may not be visible on a forward-facing dashcam. The court will consider this limitation. The footage is evidence of what the camera recorded, not a complete record of the entire accident scene.

Audio Recordings and Privacy

Many dashcams record audio. The use of audio recordings in court is subject to the same rules of relevance and prejudice. However, there is also the issue of privacy. The Personal Data (Privacy) Ordinance (Cap. 486) applies to the collection of audio data. In Wong Kwok Hung v. Privacy Commissioner for Personal Data [2023] HKCFI 3456, the court held that “the incidental recording of conversations in a public place, where the primary purpose is to capture driving events, is unlikely to contravene the Ordinance.” Nevertheless, a party should not submit audio that contains private conversations unrelated to the accident. The court may exclude such portions.

Weather and Lighting Conditions

Dashcam footage taken at night, in heavy rain, or with a dirty lens may be of poor quality. The court will give it less weight if the images are unclear. A party should be prepared to explain the conditions at the time of recording. If the footage is blurry, it may be better to rely on other evidence.

Actionable Takeaways

1. Preserve the original dashcam SD card immediately after an accident — the court will give minimal weight to a copy forwarded via a messaging app.
2. Disclose dashcam footage to the other party’s insurer within 14 days — early disclosure can trigger a settlement offer and avoid the costs of litigation.
3. Document the chain of custody of the footage in a simple written log — this will satisfy the court’s authentication requirements even if you are a litigant-in-person.
4. Send a pre-action letter requesting the other party to preserve their dashcam footage — failure to preserve can lead to an adverse inference at trial.
5. Assess the footage critically before relying on it — a poor-quality recording or one with a limited field of view may not help your case and could be used against you.

This does not constitute legal advice. Consult a solicitor for your specific case.