Blue-Green Glow: Federal Regulators Propose Standard for Driverless Vehicles
The NHTSA is suggesting a uniform cyan light for autonomous cars to help drivers and police distinguish them from human-operated traffic.
By Andrew Fletcher ·
Commuters and pedestrians in the Southeast will soon have a clearer visual cue to identify when a car is being driven by a computer rather than a person. Federal regulators have proposed a specific standard for driverless vehicles to display a distinct blue-green light, aiming to eliminate the confusion caused by inconsistent signals from various autonomous car operators. This move seeks to provide a uniform way for robotaxis to announce their automated status to everyone on the road.
The National Highway Traffic Safety Administration (NHTSA) has released proposed changes to Federal Motor Vehicle Safety Standard No. 108. The update specifically rewrites rules to accommodate autonomous vehicles, blending a reduction in regulatory hurdles with a new communication standard. The core of the proposal is the introduction of cyan-colored marker lamps designed to signal when an automated driving system is in control.
The choice of cyan is strategic. The automotive industry already utilizes red, amber, white, and flashing blue or red lights for standard functions like braking, turning, and emergency services. By selecting a blue-green hue, the agency aims to fill a visual gap without creating confusion for other road users. This approach allows for a clear distinction between human-driven and machine-driven vehicles without relying on complex text displays or audio alerts.
While the proposal draws on existing industry experiments, it seeks to establish a national framework. Mercedes-Benz previously received state-level approval for turquoise lights on its Level 3 Drive Pilot vehicles, though the company later shifted to a different system. Now, NHTSA wants to create a uniform standard that operators like Waymo, Nuro, and Zoox, as well as manufacturers like GM and Mercedes, can adopt consistently across the country.
Under the new rules, cyan marker lights would remain optional for manufacturers. However, by defining official standards for color, brightness, and placement, the agency ensures that any automaker choosing to implement these lights uses a legally consistent setup. This prevents a fragmented landscape where different companies use different colors or configurations, which could otherwise confuse drivers and law enforcement.
The proposal also streamlines regulations by removing requirements that do not apply to vehicles without human drivers. Current rules mandate physical hazard switches, manual beam shifters, and turn levers, which are unnecessary for autonomous designs. NHTSA proposes eliminating these requirements and updating the 12.8-volt testing standard to align with modern LED architectures, reducing administrative burdens for automakers.
This regulatory update is part of a broader Department of Transportation initiative to facilitate the deployment of autonomous vehicles. The goal is to make it easier for manufacturers to build cars without traditional controls like steering wheels and pedals. However, the agency is still enforcing existing rules, as evidenced by a recent audit query into the Tesla Cybercab regarding the absence of required design features such as sideview mirrors and pedals.
By standardizing the visual language of driverless cars, the NHTSA aims to enhance safety and public understanding. The proposed cyan lights serve as a simple, immediate indicator of automation, allowing road users to adjust their behavior accordingly. This step toward uniformity marks a significant shift in how the federal government regulates the evolving landscape of autonomous transportation.
Source: The Verge
