NHTSA proposed changes to U.S. vehicle-lighting rules on October 23, 2026, including standards for optional cyan marker lights on vehicles equipped with an automated driving system (ADS). The proposal addresses a practical question: how can people outside a vehicle recognize when it is operating without an occupant being expected to watch the road?

What the cyan lights would mean

The draft specifications call for steady-burning lamps visible from the front, rear and both sides. They could activate when roadway monitoring is not expected of an occupant, and would have to deactivate when that expectation returns. All ADS marker lamps would switch together. These are proposed operating rules, not permission for ordinary drivers to add decorative cyan lights.

Installation would remain optional. NHTSA says it lacks sufficient evidence to require every ADS-equipped vehicle to carry these markers. An unlit vehicle therefore could not reliably be read as human-driven simply because this proposal exists.

Other lighting changes are included

The package would also revise manual lighting-control requirements for ADS-only vehicles, allow design-specific test voltages for integral-beam headlamps, and loosen the prescribed vertical arrangement of high and low beams. NHTSA says this proposal is separate from the broader lighting-rule negotiation announced earlier in October.

What remains undecided

This is a proposed rule, not a final requirement. The notice was signed October 22; the agency announced it October 23. The posted pre-publication document leaves the comment deadline as 30 days after Federal Register publication. A final calendar deadline should be checked against that publication, not calculated from the press-release date. Final specifications and adoption remain unresolved.

Reporting status: Official proposal confirmed. Market: United States. Source check: October 24, 2026.

Sources

• NHTSA announcement, October 23, 2026 — proposal scope, optional cyan markers and separate lighting-rule process.
• NHTSA proposed rule, docket NHTSA-2026-1519 — signature date, comment-period wording, optional status and activation requirements; see the opening pages, ADS Marker Lamps section and proposed Table I-a.