Regulatory Road Sign (R3-5a)
Straight Through Only Lane Sign Meaning & Driving Rules
Mandates that traffic in this lane must proceed straight ahead; turns are prohibited from this lane.
Required Driver Action & Right-of-Way Protocol
Proceed straight through the intersection. Do not attempt to turn from this lane.
Detailed Overview & Purpose
The Straight Through Only sign (R3-5a) designates a dedicated through-lane where turning left or right is illegal. This keeps through-traffic flowing freely without being blocked by turning vehicles.
Key Standard & Origin: Prevents drivers from making turns across adjacent dedicated turning lanes.
Where You'll Find This Sign
Multi-lane intersection approaches and complex urban interchanges.
Common Driver Mistakes to Avoid
Attempting to turn right or left from a through-only middle lane.
How This Sign Appears on the DMV Knowledge & Road Test
Tests lane assignment discipline at multi-lane signalized junctions.
Legal Penalties and Moving Violations
Turning from a through-only lane carries improper lane use citations.
When you encounter the official Straight Through Only Lane (R3-5a) on a roadway, what is your legal duty?
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