Mercedes-Benz isn’t taking the autonomous driving initiative lightly. They recently introduced a notable innovation: turquoise position lights. These lights are located at the front and rear of the vehicle and light up when the autonomous driving system is activated.
Why turquoise?
This initiative aims to clearly inform other road users that a vehicle is in autonomous mode, thereby enhancing safety and mutual understanding on the road.
The choice of the turquoise color is not random. According to Mercedes-Benz, this shade has a significant advantage: turquoise is not used in current road signaling, reducing the risk of confusion for motorists, pedestrians, and law enforcement.
Moreover, this color is easily recognizable under any weather or lighting conditions. Finally, studies have shown that turquoise is perceived favorably by road users, eliciting positive reactions compared to other colors.
It’s not quite LED blue. It’s not the standard white of daytime running lights. Mercedes-Benz has a very specific request for how self-driving cars should announce their presence on the road. They want them to glow turquoise.
This isn’t just aesthetic flair. It’s a push for a global standard. The German automaker is lobbying hard for this specific shade to become the universal signal for autonomous mode. The logic is simple but critical. Current systems rely on icons on dashboards or generic blue lights on Waymo’s robotaxis. Those don’t work well for pedestrians trying to gauge intent at a busy intersection.
A dedicated, standardized color would cut through the noise.
The groundwork for this is already being laid. The SAE International has incorporated turquoise into its J3134 standard for autonomous vehicle lighting. This isn’t theoretical. It’s in the technical documents. Furthermore, the UN Economic Commission for Europe (UNECE) is drafting regulations that likely align with this push. China, which has strict certification requirements for tech-heavy vehicles, is also factoring this into its regulatory framework.
Mercedes isn’t waiting for the law to catch up. They are testing in the wild.
Testing in the US and Europe
The road tests started in late 2023. The locations matter. Nevada and California are the proving grounds. These states have long been at the forefront of autonomous vehicle legislation. Testing there provides data that regulators in other regions tend to respect. If it works in Silicon Valley and Las Vegas, other jurisdictions take note.
Europe is a different beast. Regulations are tighter. Currently, turquoise lights are illegal on public roads across the continent. Most European nations strictly control exterior lighting colors to prevent confusion with emergency vehicles or law enforcement. Red, blue, and amber have reserved meanings. Introducing a new one creates chaos until it’s standardized.
Mercedes needed a loophole. They got one.
The Regional Council of Stuttgart granted a special derogation. This exemption allows Mercedes to experiment with turquoise lighting on public roads until 2028. Stuttgart is the heart of Mercedes’ engineering. It makes sense they’d test their own tech in their backyard, even if it breaks local norms temporarily.
The Human Factor
Why does this matter? Because autonomy isn’t just about sensors. It’s about communication.
Pedestrians interact with cars every day. They look for eye contact. They look for brake lights. They look for indicators. When a car is driven by software, that human connection is severed. The turquoise light is a bridge. It tells the world: “Do not make eye contact. I am not looking for you. I am following the code.”
It reduces anxiety. It increases predictability.
Without a standard, we risk a fragmented landscape. One manufacturer uses blue. Another uses a pulsing amber. Another uses nothing but a small icon. This fragmentation defeats the purpose. A universal signal creates a common language between machine and human.
Mercedes is betting that turquoise will be that language. The tests in the US are gathering data on recognition rates. The trials in Stuttgart are exploring legal and safety boundaries. The outcome will likely influence how UNECE writes its final rules.
The timeline is set. 2028 is the deadline for the European tests. If the data supports the initiative, the push for a global standard will
