A viral TikTok video is raising questions about how much autonomous vehicles can “see” inside their cabins after a group of Miami women appeared to test the limits of a Waymo ride, only to be caught mid-trip.
In a clip posted by Girthmaster (@tinywaistlargebutt) on TikTok, the group documents what they say was an attempt to sneak a fifth passenger into a Waymo vehicle, despite capacity rules. The text overlay reads: “When we tried to hide a fifth person in the Waymo and they discovered her mid ride.”
The video, which has racked up more than 8 million views, shows the group reacting in disbelief as a voice from Waymo’s support system appears to call them out.
Girthmaster attempted to convince the system that the extra rider had exited the vehicle once the car stopped. The response, she claims, suggested otherwise, and included a warning that the ride could be canceled.
Commenters immediately debated the ethics of in-cabin surveillance. “Is someone watching you while you’re in the car? How do they know 
,” one commenter wrote. Another added, “The car was like ‘there’s Waymo people in the car.’”
According to Waymo’s rider guidelines, the number of passengers allowed in a vehicle is limited by seatbelt availability. Most Waymo vehicles—typically modified versions of models like the Jaguar I-PACE—seat up to four riders. Exceeding that limit violates safety rules and can result in a cancellation.
Does Waymo “see” inside cars?
The company has said publicly that its vehicles use interior sensors and cameras to help ensure rider safety and compliance with policies. These systems can detect whether seat belts are fastened, whether riders are behaving safely, and potentially how many occupants are in the car. In some cases, remote human support staff may also be available to assist or intervene if an issue arises during a ride.
To be more precise, Waymo vehicles are equipped with 29 cameras in total (including interior and exterior), plus LiDAR and radar. The interior cameras are the primary tool for this type of occupancy detection.
Waymo also uses weight sensors in the seats—similar to the ones that trigger seatbelt reminders in traditional cars. This is often the first “trigger” that alerts the system to an extra body before a human agent even looks at the camera feed.
That combination of automated monitoring and human oversight may explain what happened in the viral TikTok, though Waymo does not publicly detail every aspect of its in-cabin detection systems.
The incident highlights a broader tension surrounding autonomous technology: convenience versus privacy. While rider monitoring can improve safety and enforce rules, it can also leave passengers wondering how much oversight is happening behind the scenes.
For now, Waymo’s policies are clear: riders must follow capacity limits and safety guidelines. Attempts to bypass those rules—whether by squeezing in an extra passenger or otherwise—can lead to warnings or trip termination, as Girthmaster found out.
