Guide & Services Road Sign (M1-4)
US Highway Route Marker Sign Meaning & Driving Rules
Identifies a designated route in the historic United States Numbered Highway System.
Required Driver Action & Right-of-Way Protocol
Follow the posted speed limit and be prepared for signalized intersections and cross-traffic.
Detailed Overview & Purpose
The US Highway Shield (M1-4) marks federal highways established in 1926 (such as US 101, US 1, US 66). Unlike interstates, US routes are often multi-lane or two-lane surface highways with signalized intersections.
US Route numbering runs opposite to interstates: odd-numbered routes run North-South (increasing from east to west, with US 1 on the East Coast and US 101 on the West Coast), while even-numbered routes run East-West (increasing from north to south).
Key Standard & Origin: US Route numbering is the inverse of interstates: US 1 is on the Atlantic Coast, while I-5 is on the Pacific Coast!
Where You'll Find This Sign
Along federal highways, surface arterials, and connector routes nationwide.
Common Driver Mistakes to Avoid
Confusing US surface highways with fully grade-separated Interstate freeways; US highways have traffic lights and driveways.
How This Sign Appears on the DMV Knowledge & Road Test
Tests recognition of US Route shields vs. Interstate shields vs. State route markers.
Legal Penalties and Moving Violations
None; guide sign.
Sign Variations & Related Types
State Route Marker (M1-5)
State-specific shape (keystone in PA, sunflower in KS, state outline in CA/OH).
When you encounter the official US Highway Route Marker (M1-4) on a roadway, what is your legal duty?
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