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Are Sequential Indicators Legal in the UK?

Conditional

Sequential ("scrolling") indicators are legal in the UK only if they meet the indicator rules: amber light, an approved E-marked unit, and a steady flash rate of 60 to 120 per minute. Many aftermarket kits do not, which makes them illegal.

Why?

Factory-fitted sequential indicators - the sweeping amber bar on many modern cars - are legal because they are type-approved and still behave as a proper indicator. The rules are set by the Road Vehicles Lighting Regulations: indicators must be amber (to front and rear on modern cars), approved, and flash between 60 and 120 times a minute.

The problem is with cheap retrofits. An unapproved LED unit, one that is not E-marked, one that scrolls at the wrong rate, or one that turns the signal into a slow animation rather than a clear on/off flash does not meet those rules and is not road-legal, even though it looks similar.

So the part itself is not banned; the implementation decides it. A properly approved sequential unit that flashes at the right rate is fine, and the MOT lighting check is where a non-compliant one gets caught.

What decides if it's legal

  • Indicators must show amber and be E-marked/approved.
  • They must flash at a steady 60 to 120 times per minute.
  • The scrolling must read clearly as a single indicator, not a light show.
  • Non-approved LED units or wrong colours are not road-legal.

Does it depend on your car?

Whether an approved sequential unit exists depends on the car and its light clusters. The indicator rules - amber, approved, 60 to 120 per minute - apply identically to every vehicle.

Related legality guides

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Sources

This page is general guidance, not legal advice, on the rules in the UK for sequential indicators. The detail varies by exact vehicle and changes over time - confirm with your insurer and the latest DVSA and GOV.UK guidance before modifying.