MandatoryB21a2
Keep left
What does the “Keep left” sign mean?
The “Keep left” sign belongs to the “Mandatory” family of the French highway code. Mandatory signs are round with a blue background. They require the driver to follow a direction, lane or behaviour.
Updated 2 July 2026
Sign name
- Français
- Contournement obligatoire par la gauche
- العربية
- تجاوز إلزامي من اليسار
- English
- Keep left
Other signs in the same family
Sources: Sécurité routière (securite-routiere.gouv.fr) and service-public.fr.
Illustration : Roulex 45 — CC BY-SA 4.0 · Wikimedia Commons · Credits & attributions