Feds want robotaxis to signal ‘I’m driving’ with cyan-colored lights

NHTSA is proposing cyan-colored marker lamps for vehicles operating under an automated driving system. The blue-green light would provide a common visual signal that no human is driving at that moment. This matters because robotaxis may lack familiar controls and need another way to communicate their operating status.

The proposed lamps would be visible to law enforcement officers and other road users. NHTSA wants to standardize their color, brightness, and location. That could prevent different operators from using unrelated colors or signals that people might misunderstand. The aim is a consistent message across autonomous vehicles.

The lights would not be required under the proposal. Manufacturers and operators could choose whether to install them, including companies such as Waymo, Nuro, Zoox, GM, and Mercedes. NHTSA is also proposing broader updates for vehicles designed without traditional driver controls, while regulators continue enforcing existing rules.

Manufacturers would not have to install cyan lights under NHTSA’s proposed rule. Instead, the agency would create an official federal standard for companies that choose to use them. That standard would cover the lights’ color, brightness, and location, making voluntary systems more consistent.

Potential users include robotaxi operators Waymo, Nuro, and Zoox. Automakers such as GM and Mercedes could also adopt the signal. The rule is designed to let different companies communicate the same basic message rather than creating separate colors or patterns for each vehicle.

This optional approach gives manufacturers flexibility while still setting a national framework. Mercedes-Benz already received state-level approval for turquoise lights on Level 3 Drive Pilot cars, although it later dropped that plan after moving toward a Level 2++ system. NHTSA wants any future systems to follow one recognizable setup.

The cyan signal is meant to identify a vehicle being controlled by an automated driving system. NHTSA says it would clearly and consistently signal this condition to law enforcement and other road users. The light would therefore communicate the vehicle’s operating status from outside.

The mechanism is simple: a distinctive blue-green marker lamp would appear when the automated system is operating. NHTSA proposes standards for its color, brightness, and location so people would not need to interpret different signals from different companies. Cyan would act as a shared visual language for eligible vehicles.

The proposal does not make the lights mandatory. It gives manufacturers an optional, standardized way to identify automated operation. Meanwhile, existing rules still apply. NHTSA opened an audit query into Tesla’s Cybercab over certification issues involving absent sideview mirrors, pedals, and a steering wheel, which current standards require.

NHTSA chose cyan because other major vehicle-light colors already carry familiar meanings. Red, amber, and white are used for functions such as braking, turning, and headlights. Flashing blue and red lights are associated with emergency vehicles. Adding another use to those colors could make road signals harder to interpret.

Cyan, a blue-green color, could occupy a visual gap between those established signals. The article describes this as a theoretical advantage rather than a guarantee. NHTSA’s proposal would also define the lamp’s brightness and location, not just its color. Those details would help create a consistent signal.

There is some precedent for the idea. Mercedes-Benz received state-level approval for turquoise lights on Level 3 Drive Pilot cars. The automaker later abandoned that plan in favor of a Level 2++ system, but NHTSA still wants a national standard that other operators and automakers can use.

NHTSA’s proposal identifies five requirement areas for removal or revision. Three concern physical controls that may not make sense in a vehicle without a human driver: hazard switches, manual beam shifters, and turn levers. The agency proposes removing those requirements.

A fourth change would update the 12.8-volt testing standard. That revision would let automakers design around modern LED architectures without unnecessary administrative obstacles. A fifth area concerns the required position of high-beam lights relative to low-beam lights. NHTSA is considering removing that placement requirement.

The count covers the distinct items named in the article, not every technical detail in the broader proposal. The same package would also establish optional cyan-light standards for automated vehicles. Together, the changes are intended to accommodate vehicles without traditional controls while preserving a consistent lighting framework where one is useful.

An automated driving system, or ADS, is the technology that operates a vehicle while the vehicle is driving without a human driver. The article uses the term for the system whose operation would trigger the proposed cyan signal. It does not provide a formal technical definition beyond describing human-free vehicle designs.

In established industry usage, Level 2 driver assistance still requires a human driver to monitor and remain responsible for driving. Level 3 systems can automate driving in defined conditions, but a human must be available to take over when requested. By contrast, the article discusses ADS-equipped vehicles designed to operate without traditional driver controls.

The distinction matters for regulation. Current rules require features such as steering wheels, pedals, mirrors, hazard switches, and turn levers. NHTSA wants to remove or revise requirements that do not fit human-free designs, while still enforcing existing standards, as shown by its Cybercab audit query.

Federal Motor Vehicle Safety Standards, or FMVSS, are federal requirements that vehicles must meet for regulated safety and design features. The article focuses on FMVSS No. 108, which covers lighting and related equipment. NHTSA is proposing changes so those rules better fit autonomous vehicles.

These standards determine what manufacturers can legally certify and build. Current requirements include physical controls and features associated with human driving, such as steering wheels, pedals, and sideview mirrors. A vehicle designed without them may not match the existing rulebook, even if it is intended to operate through an automated system.

The Tesla Cybercab illustrates the issue. NHTSA opened an audit query into the vehicle’s certification and related technical data because it lacks sideview mirrors, pedals, and a steering wheel. The proposed updates could streamline future human-free designs, but existing requirements continue to apply until regulators change them.