In France, permanent warning road signs normally have a white background.
French warning signs are generally upright triangles with a red border and a black symbol on a white field. The symbol identifies the hazard, such as a bend, crossroads, children, animals or roadworks. This combination is part of France’s broader system of signs based on European conventions.
Temporary warning signs differ visually. Roadworks and other temporary hazards may use a yellow background so that the temporary instruction stands out from permanent information. That distinction is why photographs of French roads can show both white- and yellow-background warning triangles.
The background should not be confused with the colour used for route or destination information. French directional signs use several colours according to road type and destination, while warning signs communicate danger primarily through their triangular outline and red border.