California Lane Markings Explained
The lines painted on the road are a legal communication system. Crossing the wrong line at the wrong time is not just dangerous — it's a traffic violation. Here's what every marking on California roads means.
Yellow Line Rules
Yellow lines divide traffic flowing in opposite directions. A single broken yellow line means passing is permitted when safe. A single solid yellow line means passing is discouraged but not always prohibited. Double solid yellow lines mean no passing in either direction — you may not cross them except to turn into a driveway or when directed by an officer.
White Line Rules
White lines separate traffic moving in the same direction. A broken white line means lane changes are permitted. A solid white line means stay in your lane — do not cross unless necessary (such as at an intersection for a turn). Double solid white lines, often used near HOV lanes, prohibit crossing.
Special Lane Markings
HOV (carpool) lanes are marked with a diamond symbol on the pavement and signs indicating the minimum occupancy requirement, usually 2 or 3 people. Bicycle lanes are marked with a white solid line and a bicycle symbol. Two-way left turn lanes (center turn lanes) have yellow lines on both sides and are shared by traffic traveling in both directions for left turns only — not for passing or through travel.
Key Rules at a Glance
- Double solid yellow lines: No passing in either direction
- Broken white line: Lane changes permitted
- Solid white line: Stay in lane; do not cross
- Diamond marking: HOV/carpool lane
- Center turn lane (two-way left): For left turns only — not passing