Mandatory sign
Keep left
A blue circle with an upward-left arrow tells you to keep left. It is placed at traffic islands, central reservations and other obstructions you must pass on the left.
When you see it
- ◆ Pass the island or obstruction on the side the arrow points to.
- ◆ A mirror-image "keep right" sign means pass on the right instead.
- ◆ Move into position early and do not cut across the island.
- ◆ Watch for pedestrians using the island to cross.