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Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Yes—the overnight honking was real, but the cars were not “talking” to one another. In the summer of 2024, driverless Waymo vehicles repeatedly sounded their horns while maneuvering in a tightly packed San Francisco parking lot. A proximity-warning feature intended to prevent low-speed collisions was triggered again and again as multiple robotaxis tried to reverse, turn, leave, or return at the same time.
Yes—the overnight honking was real, but the cars were not “talking” to one another. In the summer of 2024, driverless Waymo vehicles repeatedly sounded their horns while maneuvering in a tightly packed San Francisco parking lot. A proximity-warning feature intended to prevent low-speed collisions was triggered again and again as multiple robotaxis tried to reverse, turn, leave, or return at the same time.
The result was an unusually visible example of a broader technology problem: a safety behavior that made sense on a normal street became a persistent nuisance when many autonomous vehicles interacted inside a constrained overnight staging area.
Where and when the Waymo honking happened
The incident centered on a parking lot in San Francisco’s SoMa neighborhood, near Second and Harrison streets. Waymo vehicles began filling the lot in late July 2024. Residents reported that the cars became especially active during the early-morning hours, with groups of vehicles attempting to leave or return at roughly 2 a.m. and 4 a.m.
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According to local reporting, dozens of vehicles could become congested as they tried to angle into position. Residents described hearing short pairs or bursts of honks from the apartment building beside the lot, including reports of noise around 4:30 a.m. and, even after an initial software fix was announced, around 5 a.m. on August 18.
The problem became difficult to ignore because it was not a single malfunctioning car. It was a fleet repeatedly performing similar maneuvers in the same confined space.
Why were the self-driving cars honking?
Waymo said the vehicles were using a safety feature designed to sound the horn when another vehicle came too close while the Waymo car was reversing. The intended situation was similar to a human driver slowly backing out of a parking space and using the horn to warn a nearby vehicle.
That explanation matters. The robotaxis were not deliberately exchanging messages or engaging in a kind of conversational “robot car” behavior. They were repeatedly applying a low-speed collision-warning rule while maneuvering near one another.
On an ordinary city street, the warning might activate occasionally and serve its intended purpose. In the SoMa lot, multiple autonomous vehicles were making tightly coordinated or competing movements in a small area. One vehicle’s maneuver could place it near another vehicle that was also reversing or repositioning, causing more warnings and more noise.
The mismatch was environmental: the horn feature was designed for occasional proximity warnings, but the parking lot created repeated vehicle-to-vehicle interactions at a density Waymo said it had not anticipated.
A resident turned the nuisance into a livestream
Sophia Tung, a resident and software engineer, began documenting the activity with a 24-hour YouTube livestream after being repeatedly disturbed. She gave it the tongue-in-cheek title “LoFi Waymo Hip Hop Radio Self Driving Taxi Depot Shenanigans to Relax/Study To.”
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The stream transformed a local complaint into a technology spectacle. A neighbor’s viral social-media video and Tung’s footage helped demonstrate that the honking was recurring, rather than an isolated sound someone happened to hear once. The livestream also gave viewers an unusual look at how a driverless fleet behaved when parked and staged outside normal passenger service.
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Coverage eventually reached an international audience. A Waymo executive visited Tung, explained the issue, and apologized to neighbors, according to reporting from the San Francisco Chronicle.
Waymo announced a software fix—but the noise did not stop instantly
On August 13, 2024, Waymo said it had updated the vehicles’ software so they should reduce the noise affecting nearby residents. The company’s announcement was an important step, but it should not be described as an instant, perfect resolution.
Residents told the San Francisco Standard that some honking continued after the initial fix. That could reflect vehicles that had not yet received the change, remaining edge cases, or other parking-lot interactions; the available reporting does not establish exactly why every later sound occurred.
The later outcome was more positive. Chronicle reporting published in September 2024 said that the recurring late-night honking had stopped after a software update and direct engagement between Waymo and residents.
| Date | What happened |
|---|---|
| Late July 2024 | Waymo vehicles began filling the SoMa lot near Tung’s building. |
| Early August 2024 | Residents reported repeated overnight honking; Tung began the livestream. |
| August 13–14 | Waymo explained the reversing-proximity warning and announced a software adjustment. |
| August 18–19 | Neighbors said some noise continued despite the initial fix. |
| September 15 | Later reporting said the recurring late-night honking had stopped. |
Was this evidence that Waymo’s cars were unsafe?
It was evidence of a deployment and design problem in a specific setting. It was not, by itself, evidence that Waymo’s entire driving system was unsafe or that the vehicles were randomly malfunctioning.
The affected behavior involved parking-lot maneuvering and neighborhood noise, not a reported high-speed road collision. The horn was also connected to a safety objective: warning of a possible low-speed collision. The failure was that the warning activated too often in a dense, repetitive environment.
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That distinction does not make the disturbance trivial. A feature can be safety-motivated and still be badly suited to a particular facility. Residents were entitled to expect a commercial fleet operating beside homes to account for predictable overnight noise.
Waymo separately publishes company-reported safety analyses for road operations, including a rider-only crash comparison covering 7.14 million miles through October 2023. Those analyses should not be treated as a direct measurement of the parking-lot incident. They address a different operating question.
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Were the vehicles truly driverless?
There was no human driver inside the vehicles during the observed parking behavior, which is why residents experienced the scene as a fleet of empty cars moving and honking on its own.
That does not mean the vehicles operated without any human oversight anywhere in the system. Waymo describes a driverless service while also maintaining operational personnel and community-response processes. “Driverless” refers to the absence of a human driver in the vehicle; it should not be expanded into a claim that no people monitored, managed, or responded to the fleet.
Was Waymo allowed to operate in San Francisco?
Waymo’s San Francisco passenger service operated under California regulatory authorization. The California Public Utilities Commission approved the company’s authority to offer fared driverless passenger service throughout San Francisco at any time in August 2023, subject to the applicable regulatory framework.
That operating authorization provides context, but it does not establish that the parking-lot honking violated a particular local noise rule. The available reporting supports describing the event as a neighborhood nuisance and software-environment mismatch—not as a confirmed legal violation.
What happened after 2024?
The recurring late-night honking described in this incident should be treated as a resolved 2024 episode based on the later reporting available in this research. It should not be presented as an uninterrupted three-year noise event.
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There were, however, later complaints involving Waymo vehicles in the same broader SoMa area. Reporting from June 11, 2026, discussed vehicles occupying garage space, blocking or slowing resident access, and creating parking-related friction at a SoMa condominium. That coverage referenced the 2024 honking as an earlier neighborhood issue, but it did not establish that the same all-night honking pattern continued into 2026.
These are related in the broad sense that both involve autonomous-vehicle fleets and neighborhood operations. They should not be described as the same software failure unless a source specifically connects them.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.The larger lesson for autonomous fleets
The SoMa episode shows why testing an autonomous vehicle only on public roads is not enough. Fleets also have to handle depots, charging areas, apartment garages, loading zones, and other facilities where many vehicles may converge with little room to maneuver.
A warning designed for a human driver may have different consequences when it is deployed across dozens of networked vehicles. Humans generally do not reverse and reposition an entire fleet of nearly identical cars in a tightly timed overnight cycle. Autonomous systems can do exactly that, making a small interaction repeat hundreds of times.
The engineering response is therefore not necessarily to remove every safety warning. It may involve better context awareness: recognizing a managed staging lot, coordinating vehicle movements, reducing redundant alerts, changing horn behavior at very low speeds, or routing vehicles so they do not repeatedly trigger one another.
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For neighbors, the lesson is equally practical. “Autonomous” does not mean “impact-free.” The cars may drive without a person in the seat, but their sounds, parking patterns, access demands, and operating schedules still affect the surrounding community. Those effects need to be tested and managed as part of the service—not discovered by residents at 4 a.m.
Frequently Asked Questions
Were the Waymo cars honking at each other on purpose?
No. Waymo said the vehicles were sounding a proximity warning when another vehicle came too close while reversing. The repeated noise made the cars sound as if they were communicating, but the behavior was a safety alert, not a conversation.
Did Waymo fix the overnight honking problem?
Waymo announced a software update on August 13, 2024. Residents initially said some noise continued, but later reporting said the recurring late-night honking had stopped after a further software update and direct engagement with neighbors.
Where did the Waymo honking happen?
The reported incident took place in a SoMa parking lot near Second and Harrison streets in San Francisco, where multiple Waymo vehicles were staging, leaving, and returning overnight.
Did the honking prove that Waymo’s self-driving technology was unsafe?
The incident supports a narrower conclusion: a safety behavior performed poorly in a crowded parking-lot environment. It does not by itself prove that Waymo’s entire autonomous-driving system was unsafe on public roads.
The Bottom Line
Bottom line: Waymo’s cars honked because a proximity-warning feature repeatedly activated while multiple vehicles reversed and maneuvered in a crowded SoMa lot. Waymo announced a software change on August 13, 2024; residents initially reported lingering noise, but later reporting said the recurring late-night honking stopped. The incident was a localized parking-lot design and deployment problem—not proof that the cars were communicating, or that Waymo’s entire driving system was unsafe.
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