Mercedes gets approval for turquoise automated driving lights

Original Article ↗ Hacker News Discussion ↗

Mercedes-Benz has gained U.S. approval to use turquoise exterior lights to signal when its Level 3 “Drive Pilot” automated driving system is active, with the color standardized by SAE for all manufacturers. Commenters debate whether visibly marking self-driving cars will improve safety and reduce unnecessary police stops, or instead encourage other road users to exploit predictable AV behavior by cutting them off or stepping in front of them. The choice of color raises technical and accessibility concerns, including interference with night vision, confusion with existing blue emergency lights, and poor distinguishability for people with red‑green color blindness, alongside broader questions about the narrow conditions under which Level 3 can operate and Mercedes’ decision to accept legal liability.

Purpose of the turquoise lights

  • Lights indicate Level 3 automated driving is active, mainly so:
    • Police don’t mistakenly stop drivers who are legally allowed to watch movies / use infotainment when the system is engaged.
    • Other road users aren’t alarmed when occupants aren’t looking at the road.
    • Emergency services understand the car may be in control in medical situations.
  • Some see it as useful extra context in mixed human/AV traffic, akin to “Student Driver” signs or distinctive Waymo vehicles.

Debate on behavior and social dynamics

  • Some argue drivers shouldn’t behave differently, but note that in practice they will:
    • People may cut in more aggressively, knowing AVs will always yield and avoid collisions.
    • Pedestrians may feel safer stepping out, especially in non-crosswalk situations.
  • Others doubt people will risk physical harm just to “bully” AVs and compare to automated airport trains, where abuse is rare.
  • There’s concern about insurance fraud targeting AVs, countered by the point that AVs heavily record data, which could deter fraud.

Color choice, visibility, and accessibility

  • Turquoise is standardized by SAE for Level 3; seen as branding-friendly but controversial:
    • Worried it adds more blue light, potentially affecting vision and comfort at night.
    • Some say headlights already dominate night-vision impact; these lights are DRL-like and relatively dim.
  • Colorblindness concerns:
    • For many red–green colorblind people, the chosen turquoise is near their “white” point and may be indistinguishable from white reverse lights, especially given similar placement.
    • Suggestions include alternative colors (e.g., orange), standardized positions/shapes, or light patterns; concern that the revised greener shade wasn’t re-evaluated for accessibility.
  • Some question visibility alongside bright headlights and existing running lights.

Level 3 autonomy and legal/liability issues

  • Mercedes’ Drive Pilot is praised for taking legal liability when active; viewed as essential “table stakes” for real autonomy claims.
  • System is heavily constrained: currently only in CA/NV, on pre-mapped freeways, below ~40 mph, in clear daytime conditions, with a lead vehicle, and not in construction zones.
  • Comparison with Tesla and others:
    • Many say Tesla has a very capable Level 2 system but oversells it as a path to “Full Self-Driving.”
    • Others call the “technical lead” narrative largely marketing “smoke and mirrors,” while still acknowledging real utility as driver assist.
  • Some argue L3 that allows the driver to disengage attention (watch movies) is inherently dangerous and should be banned; others see it as acceptable under strict conditions and with manufacturer liability.