A woman was filmed apparently unconscious behind the wheel of a Tesla on British Columbia's Trans-Canada Highway on Sunday, July 5, 2026, while two children rode in the rear seat and the vehicle continued at roughly 100 km/h through mountain terrain between Golden and Revelstoke — the kind of incident safety researchers warned would happen once driver-assistance systems became capable enough to enable complacency rather than prevent it.

The reason Tesla's driver-monitoring system failed to intervene is not a software bug or a manufacturing defect. It is a design limitation documented in the FSD v12.4 release notes and confirmed in real-world use through the current generation of software: the car's cabin camera cannot reliably detect eye state through dark or polarized sunglasses, cannot confirm the driver is awake, and falls back to a steering-wheel torque check that cannot distinguish between a conscious hand and a sleeping arm resting against the rim.

Carleigh King Filmed What Happened

Carleigh King, travelling with her family along Highway 1, had pulled over because her child was carsick. That is when she noticed the grey Tesla pass by — the driver slumped to one side, wearing large dark sunglasses, eyes closed, hands nowhere near the wheel. King grabbed her phone and recorded. Her video was shared to a regional Facebook group, where it was picked up by Castanet's original video report, and then by CBC, CTV, Global News, and outlets across North America within hours.

King told CTV News she called 911 immediately. Revelstoke RCMP later confirmed they had the vehicle's license plate and were following up with the driver. Corporal Michael McLaughlin of the B.C. Highway Patrol said the department was treating the matter seriously: "You have to be awake, alert and in control at all times, even when you're using the legal driver assistance."

B.C. Ministry of Transportation reiterated that full self-driving technology is not legal in British Columbia. The province's Motor Vehicle Act prohibits driving a Level 3, 4, or 5 automated vehicle on public roads, and it bars any feature that "lets the car fully take over the driving" — explicitly including systems where the driver can take their hands off the wheel and stop monitoring the road. The vehicle in the video is a 2026 Tesla Model Y running Full Self-Driving (Supervised), which Tesla classifies as Level 2. Even at Level 2, however, B.C. law requires a driver to be "awake, alert, and in control, a hand on the wheel, feet near or on the pedals at all times."

Possible penalties for a driver caught asleep at the wheel in B.C. range from $368 to $2,000, and up to six months in jail. A legal expert interviewed by CBC said criminal charges for dangerous operation of a motor vehicle were a possibility — and, if the children in the rear seat are confirmed to have been present, charges relating to child endangerment could also apply.

How Tesla's Two-Layer Monitoring System Unravels With Sunglasses On

Tesla's driver-monitoring stack has two layers, and the B.C. incident is a near-perfect demonstration of what happens when the primary layer is knocked out.

The primary layer, introduced with FSD v12.4 release notes in May 2024, uses an infrared cabin camera mounted above the rearview mirror to track the driver's face, eye position, blink rate, and head movement. The system estimates head pose continuously — measuring yaw, pitch, and roll relative to a forward-facing reference — and issues attention strikes when the driver is not looking at the road or when hands leave the wheel for too long. It can also detect drowsiness through blink rate and blink duration monitoring.

That system struggles the moment a driver puts on very dark or polarized sunglasses. When Tesla introduced Vision-Based Attention Monitoring in FSD v12.4, the release notes specified the camera system would not be activated when "the driver is wearing sunglasses, a hat with a low brim, or other objects covering the eyes" — falling back instead to the steering-wheel torque nag. Tesla released updates beginning with FSD v12.5.4 and continuing through FSD v14.3 intended to address eyewear handling, but as Electrek reported on July 6, 2026, the large dark sunglasses worn by the driver in the B.C. incident prevented the camera from confirming attention, and the system fell back to its secondary layer. When eye-tracking becomes unavailable, the system falls back to the steering-wheel torque nag, which requires periodic application of physical force to the wheel.

The torque fallback is a categorically weaker safeguard. It does not confirm that a driver is awake. It confirms only that some force is being applied somewhere on the steering rim — force that a sleeping driver's arm, resting against the wheel, can supply. Tesla's separate Driver Drowsiness Warning feature, which monitors blink rate, yawning, and head drop, carries the same limitation: it requires an unobstructed view of the driver's eyes to function. Sunglasses that obscure the eyes defeat it entirely.

The monitoring architecture, as Tesla describes it, is built to keep attentive drivers honest — issuing reminders and strike penalties to drivers who look away or take their hands off the wheel. It is not built to catch a driver who has fallen completely unconscious, particularly when the most common reason people wear sunglasses — driving in bright daylight on an open highway — is precisely the context in which drivers are most likely to have FSD engaged.

Why Better Performance Makes This Problem Worse, Not Better

The B.C. incident arrived against a backdrop of meaningful improvements to FSD's real-world capability. Tesla's FSD v14 end-to-end architecture, introduced for current-generation hardware, processes raw camera imagery through cross-attention transformers into a continuous three-dimensional model of the vehicle's surroundings, generating steering, acceleration, and braking commands directly — a significant technical step that produces smoother and more confident performance in highway merging, lane changes, and complex intersections than earlier versions.

That competence is the problem.

Research from the Insurance Institute for Highway Safety has formally documented what human factors engineers call automation-induced complacency: the tendency of drivers using Level 2 systems to disengage from the driving task in proportion to how reliably the system handles it. The IIHS described the phenomenon as "driver disengagement and system misuse" and found that drivers who trust their ADAS to handle highway driving are measurably less vigilant even while legally required to supervise the system. A 2014 NHTSA human factors study documented that braking reaction time for drivers using Level 1 and Level 2 automation was up to 1.5 seconds longer than for drivers operating manually.

What the B.C. footage shows is not an unusual failure of individual willpower. It is the predicted behavioral output of a sufficiently capable Level 2 system paired with monitoring coverage that has a well-known blind spot. The driver did not make an unusual error. The driver did what a growing body of research predicted she would do: trusted the system to handle the drive, let her vigilance drop, and eventually fell asleep — while wearing the one accessory that neutralized the system designed to catch her.

A firmware update released as version 2025.32.3 added a feature that safety researchers found particularly troubling: when Tesla's system detects drowsiness in a driver, it reportedly responds by suggesting the driver enable FSD. The response pushes more autonomy at the exact moment a driver is least capable of supervising it.

This is not an isolated incident. In late June 2026, a Washington State Patrol trooper stopped a woman who passed him at 78 mph on I-5, apparently asleep behind the wheel of a Tesla. She received roughly $300 in citations. In April 2026, a woman on I-75 was arrested for DUI after being found unconscious in her Tesla with Autopilot running, under the apparent belief the car would complete her drive. In March 2026, an East Bay incident involved both the driver and the front passenger found asleep simultaneously. In approximately June 2026, Electrek reported that drivers in China had been defeating the same DMS camera using inexpensive plastic doll heads mounted near the cabin mirror — the camera registers a forward-facing face, scores the driver as attentive, and allows FSD to operate without any human supervision whatsoever.

Tesla Is Contesting the Legal Framework While the Road Is Contesting the Technology

The B.C. incident sits in the middle of a legal reckoning that has been accelerating throughout 2025 and 2026.

In December 2025, the California DMV's December 2025 ruling found that Tesla's use of "Autopilot" and "Full Self-Driving" in its marketing constituted deceptive advertising. The administrative law judge found that the name "Full Self-Driving Capability" was "actually, unambiguously false and counterfactual," noting that a reasonable consumer would believe a car sold under that name did not require constant, undivided driver attention — which is both technologically and legally incorrect. The ruling described Tesla's marketing as following a "long but unlawful tradition of intentionally using ambiguity to mislead consumers."

Tesla responded that sales would continue uninterrupted and, in February 2026, sued the California DMV to overturn the ruling.

The legal exposure extends beyond California. A $243 million wrongful death jury verdict against Tesla was upheld by a federal judge in February 2026 — the first major plaintiff win in an Autopilot wrongful death case; Tesla had rejected a $60 million settlement before trial. The National Highway Traffic Safety Administration launched a formal investigation into 2.88 million Tesla vehicles in October 2025, documenting 58 incidents connected to FSD including 14 crashes and 23 injuries. By March 2026, NHTSA had escalated that investigation to an engineering analysis, the final step before the agency can seek a recall, after finding that Tesla's camera-only system "fails to detect and/or warn the driver appropriately under degraded visibility conditions such as glare and airborne obscurants." Sunglasses produce an analogous visibility degradation at the camera level.

The Department of Justice has opened a criminal probe into Tesla's self-driving marketing claims. As of early July 2026, Tesla faces an estimated $14.5 billion in combined lawsuit exposure related to FSD. On April 22, 2026, Elon Musk confirmed on an earnings call that Hardware 3 vehicles — roughly four million cars sold with Full Self-Driving capability promises — will never achieve unsupervised driving.

What Drivers Can Actually Do About This Gap

Tesla has not commented publicly on the British Columbia footage. RCMP have not announced charges in connection with the incident.

For Tesla owners, the monitoring gap with dark or polarized sunglasses has been a documented concern since FSD v12.4 shipped in May 2024. What it means in practice is that driving in bright sunlight while wearing sunglasses, the most ordinary combination of conditions on a summer highway, may degrade FSD's monitoring from a camera-based attention system to a pressure-only torque check. Drivers who want the full monitoring capability active while using FSD should not wear sunglasses or hats that obstruct the cabin camera's view of their eyes.

For drivers who are unwilling or unable to give up sunglasses — which is most people driving into the afternoon sun on a highway — the practical implication is that FSD's monitoring cannot currently guarantee detection of the most dangerous form of inattention: sleep. The steering-wheel torque check provides a floor, not a ceiling.

Other manufacturers have taken different approaches. GM's Super Cruise and Ford's BlueCruise use Seeing Machines-sourced driver monitoring hardware, which handles certain occlusion conditions differently — though TechTimes has not independently confirmed whether those systems are specifically immune to the sunglasses failure mode that defeated the Tesla DMS in the B.C. case.

The structural gap will likely require a technical solution that does not depend on clear eye visibility. Near-infrared illumination strong enough to penetrate most sunglass lenses, thermal imaging of facial blood flow, or multi-modal biometric monitoring are candidate approaches — none of which is currently deployed in Tesla's production hardware.

Frequently Asked Questions

Why do sunglasses disable Tesla's driver monitoring?

Tesla's primary driver monitoring relies on an infrared cabin camera that tracks eye position, blink rate, and head pose to confirm driver attentiveness. When the camera cannot see the driver's eyes — because dark or polarized sunglasses, a hat, or any other obstruction is in the way — the vision-based system may deactivate and fall back to a steering-wheel torque sensor that can only detect physical pressure on the rim, not whether the driver is awake or paying attention. Tesla introduced camera-based monitoring in FSD v12.4 and has released subsequent updates intended to improve eyewear handling, but real-world performance with very dark or polarized sunglasses remains inconsistent, as confirmed by the July 5, 2026 British Columbia incident.

Is sleeping in a Tesla on Full Self-Driving legal in Canada?

No, and it is illegal in every Canadian province. Full Self-Driving (Supervised) is classified as a Level 2 driver-assistance system under the SAE J3016 taxonomy, meaning the driver bears full legal responsibility for the vehicle at all times. British Columbia's Motor Vehicle Act explicitly prohibits any feature that allows a driver to take their hands off the wheel or stop monitoring the road, and it bans Level 3, 4, and 5 automated vehicles from public roads entirely. A driver caught asleep in B.C. can face fines from $368 to $2,000, up to six months in jail, and penalty points — and, if children are in the vehicle, potential criminal charges for endangering a minor.

If FSD is getting better, why are sleeping-driver incidents still happening?

This is precisely the complacency paradox that the Insurance Institute for Highway Safety formally documented: a Level 2 system that performs more reliably gives drivers less reason to remain vigilant, which increases the likelihood of exactly the inattentive behavior the system is supposed to monitor. Research shows that braking reaction time for Level 2 automation users can be up to 1.5 seconds longer than for drivers operating manually. As FSD improves, it may make complacency incidents more frequent rather than less — unless the driver monitoring system is redesigned to work independently of driver eyewear and lighting conditions.

What can I do if I own a Tesla and wear sunglasses while driving?

If you use FSD or Autopilot while wearing very dark or polarized sunglasses, the vision-based attention monitoring may be inactive and the car may be relying solely on steering-wheel torque detection to confirm you are engaged with the drive. That fallback does not detect sleep. To restore full monitoring, you would need to remove eyewear that obstructs the cabin camera's view of your eyes. If that is not practical — for instance, on a sun-exposed highway — the monitoring gap is real and not fully resolvable through current settings or software. Some other Level 2 systems from competing manufacturers use different hardware that may handle certain occlusion scenarios differently; if driver monitoring while wearing sunglasses is a priority, it is worth investigating those systems' specific limitations before your next vehicle purchase.