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.
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.
How to recognise it
This sign is a trapezoid in white, the standard background for a rule you must obey. Green for directions, distances and exits. They never tell you what to do, only where things are, which is the simplest way to remember the colour.
What the test wants you to know
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.
Practise it
Reading about a sign is not the same as recognising it in half a second with an examiner watching. Every state road signs test on this site shows the sign and asks you to name it, then shows four faces and asks you to pick the right one.
Interstate Route Marker
State Route Marker