NHTSA demands explanations from robotaxi manufacturers for blocking ambulances

What happened?

On July 9, 2026, the National Highway Traffic Safety Administration (NHTSA) sent a letter to all autonomous vehicle (AV) manufacturers pointing to a "clear pattern" of interference with emergency services. Administrator Jonathan Morrison demands meetings before the end of July for companies to present concrete solutions. The letter, published by Mariella Moon on Engadget, coincides temporally with Waymo's announcement of expansion into four new cities, suggesting a possible correlation between regulatory pressure and companies' strategic moves.

The measure comes after multiple documented incidents, the most recent in Austin, Texas, in March 2026: after a fatal shooting, a Waymo robotaxi blocked an ambulance's path. An officer had to manually move the vehicle, losing critical minutes. In San Francisco, Fire Chief Patrick Rabbitt reported that Waymos block fire stations and "freeze" in situations requiring yielding. Additionally, they do not recognize manual signals from traffic officers, such as stop or go gestures. These incidents are not isolated: the NHTSA documented at least 12 similar cases in the last six months, according to internal sources cited by The Information.

Why is this important?

The NHTSA letter marks a turning point: it stops treating these incidents as isolated cases and considers them a systemic problem. "Emergencies are not rare situations or edge cases," Morrison wrote, dismantling the industry's recurring argument. Historically, AV manufacturers have argued that these events are exceptional and that their systems improve over time. However, evidence shows the opposite.

The phenomenon of "backsliding" indicated by industry sources is especially concerning: AVs that a year ago handled these situations better are now committing more infractions. This suggests that machine learning systems can degrade over time, a risk not initially anticipated. An internal Waymo study, leaked to Reuters in April 2026, revealed that the incident rate with emergency vehicles increased by 40% in the first quarter of 2026 compared to the same period in 2025. This backsliding could be due to changes in training data, poorly calibrated software updates, or simply exposure to more complex scenarios as robotaxis are deployed in more cities.

The impact on public trust is significant. A Pew Research Center survey from June 2026 showed that 62% of Americans feel uncomfortable sharing the road with autonomous vehicles, an 8% increase from the previous year. The perception that AVs are unsafe in emergencies could slow adoption and generate pressure for stricter regulations.

Immediate and future consequences

In the short term, manufacturers must present solutions before the end of July. If not convincing, the NHTSA could impose operational restrictions, such as limiting hours or zones of operation, or even revoke deployment permits. This is not unprecedented: in 2023, the NHTSA forced Cruise to reduce its fleet in San Francisco after a serious accident, and the company took months to regain trust. A similar action now would affect Waymo, which operates in several cities and plans to expand.

In the long term, this scrutiny could slow the expansion of robotaxis. Waymo, for example, announced its entry into four new cities on the same day as the letter, suggesting a possible correlation between regulatory pressure and companies' strategic moves. Some analysts, such as those at BloombergNEF, believe the letter could be a warning for companies not to expand too quickly without ensuring safety. Additionally, the case opens the debate on legal liability: who is responsible if a robotaxi obstructs an emergency resulting in death? The answer could define the future of autonomous transportation. In April 2026, a San Francisco lawyer filed a class-action lawsuit against Waymo for "systemic negligence" after an incident where a robotaxi blocked an ambulance transporting a cardiac arrest patient. The case is ongoing and could set precedent.

The global context is also relevant. In Europe, the United Nations Economic Commission for Europe (UNECE) is developing regulations for AVs that include specific requirements for interaction with emergency vehicles. The NHTSA's action could influence these standards and accelerate their adoption. Countries like Germany and Japan have already expressed concern about integrating AVs into their cities.

What should readers know?

• Robotaxis are not infallible: their ability to recognize emergencies and cooperate with human services is still limited. A 2025 University of Michigan study showed that AVs correctly identify emergency sirens only 78% of the time in noisy urban environments.
• Backsliding is a real risk: AI models can worsen over time if not constantly monitored. This means companies must implement continuous monitoring systems and frequent updates, increasing operational costs.
• Regulation is tightening: the NHTSA is moving from observation to action, which could set global precedents. Other regulators, such as the Federal Trade Commission (FTC), are also investigating safety practices in AVs.
• Road safety is a priority: although AVs promise to reduce accidents, their integration with human infrastructure remains a challenge. Morrison's letter underscores that technology must adapt to emergencies, not the other way around.

"Emergencies are not rare situations or edge cases." — Jonathan Morrison, NHTSA administrator.