What is the meaning of the black triangle diversion sign used on UK roads?

Waqi Ahmed 

The black triangle diversion sign is a temporary route guidance symbol used in the UK to help drivers follow a diversion during roadworks or closures.

Meaning:

The black triangle (▲) on a yellow background indicates a specific diversion route that drivers should follow. It helps distinguish one diversion route from another, especially when multiple diversions are in place.

Key Points:

• It is used only for temporary diversions, not permanent directions.
• You may see signs that say:
  “Follow ▲” → with an arrow showing the direction.
• Other symbols like circles, squares, or diamonds may also be used for different routes.
• The symbol remains consistent along the entire diversion so drivers can follow it easily.

Example:

If you see this sign:

Diverted Traffic ▲

It means: “Follow the black triangle signs until you return to your original route.”