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Automotive

NHTSA proposes optional cyan lights to signal autonomous vehicle operation

Electrek reports the NHTSA draft would let automakers optionally add cyan exterior lights to signal autonomous operation, an idea first pushed by Mercedes.

Updated Oct 24, 2026 · 14:15 UTC1 reports

The short version

  • The NHTSA has proposed a draft rule allowing optional cyan exterior lights to signal autonomous operation.[Electrek]
  • Mercedes first proposed the cyan lighting alongside its DRIVE PILOT level 3 system, which it trialed in California for two years.[Electrek]
  • China has released a similar optional draft standard using turquoise lights that would take effect in 2028.[Electrek]

Key facts

  • The NHTSA has proposed using cyan-colored lights to identify vehicles operating autonomously.[Electrek]
  • The draft would allow automakers to optionally include cyan lights, but would not require them.[Electrek]
  • Mercedes first put forward the cyan lighting proposal alongside its DRIVE PILOT level 3 driver assist system.[Electrek]
  • Mercedes trialed the system in California for two years.[Electrek]
  • China released a draft standard that would take effect in 2028, is optional, and uses turquoise as its proposed color.[Electrek]

What remains uncertain

  • The NHTSA measure is a draft proposal rather than a finalized rule, so its terms could change.[Electrek]
  • Electrek says the NHTSA appears satisfied with Mercedes's trial results; this is the outlet's interpretation, not a stated NHTSA position.[Electrek]

Sources

Outlet counts describe coverage, not independent confirmation. Reports may share a wire service or original source.