Regulatory Road Sign (R10-5)
Left on Green Arrow Only Sign Meaning & Driving Rules
Prohibits making a left turn during the solid green circular light; left turns are permitted ONLY on a green arrow.
Required Driver Action & Right-of-Way Protocol
Wait behind the limit line until the green arrow illuminates. Do not turn on a standard green circle.
Detailed Overview & Purpose
The Left on Green Arrow Only sign (R10-5) enforces protected-only left turns. You cannot turn left on a standard circular green light ('green ball'), even if no oncoming traffic is visible. You must wait for the illuminated green arrow.
Key Standard & Origin: Protected-only left turns eliminate the dangerous 'permissive left turn' across high-speed oncoming lanes.
Where You'll Find This Sign
Intersections with high-speed oncoming traffic, dual left-turn lanes, or restricted sightlines.
Common Driver Mistakes to Avoid
Turning left on the circular green light when this sign is posted, thinking oncoming traffic will yield.
How This Sign Appears on the DMV Knowledge & Road Test
Major permit test question: understanding protected vs. permissive left-turn signals.
Legal Penalties and Moving Violations
Turning left on a green circle when prohibited carries running-a-red-signal citations.
When you encounter the official Left on Green Arrow Only (R10-5) on a roadway, what is your legal duty?
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