Regulatory Road Sign (R4-5)
Trucks Use Right Lane Sign Meaning & Driving Rules
Mandates that commercial trucks and heavy vehicles must travel exclusively in the right lane.
Required Driver Action & Right-of-Way Protocol
Truck and commercial drivers must stay in the right lane. Passenger vehicles may pass on the left.
Detailed Overview & Purpose
The Trucks Use Right Lane sign (R4-5) restricts heavy vehicles to the right-hand travel lane on steep grades or congested urban corridors to keep left lanes clear for passenger vehicles.
Key Standard & Origin: Prevents 'elephant racing' where two semi-trucks travel side-by-side at nearly identical slow speeds.
Where You'll Find This Sign
Highway climbing grades, bridges, and urban multi-lane corridors.
Common Driver Mistakes to Avoid
Commercial trucks using the left lane on steep uphill grades.
How This Sign Appears on the DMV Knowledge & Road Test
Essential CDL exam topic on lane restriction compliance.
Legal Penalties and Moving Violations
Commercial lane restriction violations carry carrier points and driver fines.
When you encounter the official Trucks Use Right Lane (R4-5) on a roadway, what is your legal duty?
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