Warning Road Sign (W7-1a)
Hill Grade Percentage Sign Sign Meaning & Driving Rules
Specifies the steepness gradient of the upcoming downhill slope (e.g., 8% or 9% grade).
Required Driver Action & Right-of-Way Protocol
Check your vehicle's speed and gear selection. Downshift before beginning the descent.
Detailed Overview & Purpose
The Hill Grade Percentage sign (W7-1a) informs drivers of the exact engineering gradient of the descent. A grade of 6% means the road drops 6 feet vertically for every 100 feet traveled horizontally; grades above 8% are considered severe.
Key Standard & Origin: Any road grade over 6% is required by federal standards to have warning signage for commercial vehicles.
Where You'll Find This Sign
Mountain highway summits and steep descents.
Common Driver Mistakes to Avoid
Underestimating the stopping distance required on steep grades when carrying passengers or heavy cargo.
How This Sign Appears on the DMV Knowledge & Road Test
Tests understanding of road slope percentages and heavy vehicle stopping distances.
Legal Penalties and Moving Violations
Commercial drivers who fail to observe posted hill restrictions face license suspension.
When you encounter the official Hill Grade Percentage Sign (W7-1a) on a roadway, what is your legal duty?
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