Guide signs
US Route Marker sign
Marks a numbered United States highway that is not part of the interstate system, often a two lane road passing directly through towns.
- Trapezoid
- White
- MUTCD M1-4
Shape and background first
Federal designation M1-4 in the MUTCD, the national standard every state signs to. Common on roads that predate the interstate system, sometimes running parallel to an interstate for long stretches through the same corridor.
What the MUTCD specifies
Designation: M1-4
MUTCD Section 2D.11
Conventional road size: 24 x 24 in
Source: Federal Highway Administration, MUTCD 11th Edition (December 2023), Part 2, Table 2D-1, verified 2026-09-26.
What the test wants you to know
The mistake people make
Unlike an interstate, a US route can carry stoplights, driveways and pedestrians right on the roadway, so the speed habits from a limited access highway do not carry over. When a question describes a crash caused by someone treating a numbered highway like an interstate, this is the sign behind it.
