US DMV permit tests · Learn · 2 November 2026 · 7 min read

The road signs permit test takers mix up most: turn vs curve, merge vs lane ends, the no passing pennant, advisory speeds and railroad signs, per the MUTCD.

Most people get STOP and YIELD right without studying. The sign questions that cost points are the look-alikes: two yellow diamonds with nearly the same arrow, two pentagons in different colors, or a plaque whose number is not a speed limit. This guide groups the hardest signs into pairs and families and gives the one detail that separates them.

Every meaning here comes from the Manual on Uniform Traffic Control Devices (MUTCD), 11th Edition with Revision 1 (December 2025), the national standard for signs, signals and pavement markings that every state must follow or match closely. So these signs mean the same thing on every state's test.

First, the shape and color code

Before the look-alikes, lock in the system. It answers many questions on its own.

Turn or curve? Reverse turn or reverse curve?

These four warning diamonds look almost the same, and test writers love them.

• Turn: a sharp bend, about 90 degrees, in the direction of the arrow.
• Curve: a gentler bend in the direction of the arrow.
• Reverse turn: two sharp turns in opposite directions; the first goes the way the arrow starts.
• Reverse curve: two gentler curves in opposite directions.

The rule of thumb: a sharp, angled arrow means turn, a gently bending arrow means curve. Both mean slow down. A chevron alignment sign, a vertical yellow sign with a chevron, is placed in a row along the outside of a curve to show which way the road bends.

Merge, lane ends or added lane?

Three diamonds about lanes, three different jobs.

• Merge: your lane joins another from the side, so traffic must blend together smoothly. Both streams share the job.
• Lane ends: a lane on your side of the road ends ahead. Drivers in that lane must merge into the remaining lane.
• Added lane: a new lane begins ahead, for example where an entrance ramp joins. Nobody needs to merge.

The question to ask yourself is who has to move over. With merge, the two streams blend. With lane ends, only the drivers in the ending lane move over. With added lane, nobody has to.

Divided highway, divided highway ends, two-way traffic

• Divided highway: the road ahead is split by a median into separate roadways for each direction.
• Divided highway ends: the median ends ahead and the road becomes two-way with no divider.
• Two-way traffic: traffic ahead will travel in both directions on a road that was one-way or divided.

The "ends" sign is the dangerous one, because oncoming traffic is about to share your road with no barrier. Do not confuse it with the white regulatory KEEP RIGHT sign, which tells you to pass to the right of an island or median, or with the yellow double arrow sign, which warns that traffic may pass on either side of an obstruction.

The pennant: NO PASSING ZONE

The NO PASSING ZONE sign is a pennant: a sideways triangle, black on yellow. It sits on the left side of a two-way road and marks the start of a no-passing zone. No other sign in our bank uses that shape, so a sideways triangle on the left of the road is this one.

The advisory speed plaque

A small square yellow plaque with a number, mounted under a warning sign such as a curve, shows the recommended safe speed for that hazard. It is not the legal speed limit. Speed limits are white rectangles with black letters. A question asking "What does the 25 under this curve sign mean?" wants "the advised safe speed for the curve," not "the speed limit."

Two pentagons, two meanings

• School sign: a pentagon pointing upward, with a black symbol on fluorescent yellow-green. It warns of a school area or the start of a school zone, where children may be present.
• County route sign: a pentagon with a yellow county name and number on blue. It just marks a county road.

Color settles it. Fluorescent yellow-green is used for school signs, and pedestrian, bicycle and playground warning signs may also use it.

Railroad signs: round, crossbuck and STOP HERE

• Round yellow sign with an X and RR: a railroad crossing is ahead. Slow down, look, listen and be ready to stop.
• Crossbuck: white crossed blades reading RAILROAD CROSSING, at the crossing itself. You must yield to trains, and stop if one is approaching.
• STOP HERE WHEN FLASHING: a white rectangle telling you where to stop when the crossing lights or gates are working.

The round sign comes first, the crossbuck is at the tracks.

DO NOT ENTER or WRONG WAY?

• DO NOT ENTER: a red square with a white bar. It marks a road, ramp or lane you must not enter from this direction.
• WRONG WAY: a red horizontal rectangle. It warns a driver who has already turned the wrong way. Stop and turn around safely.

One stops you going in; the other tells you that you already have.

Lane control and turn signs

• TWO WAY LEFT TURN ONLY: the center lane is shared by traffic from both directions and may be used only for left turns, not for passing or traveling along.
• LEFT TURN YIELD ON GREEN: with a plain green light you may turn left only after giving way to oncoming traffic.
• Optional movement lane control: the arrows show a choice, for example straight or right, for vehicles in that lane.

Signals that act like signs

Signals are tested with signs, and two flashing lights are often mixed up.

• Flashing red: treat it as a STOP sign. Stop, then go when safe.
• Flashing yellow: proceed with caution, giving way to pedestrians and vehicles in the intersection.
• Flashing yellow arrow: you may make the turn shown after giving way to oncoming traffic and pedestrians.
• Steady yellow arrow: the protected turn is ending; get ready to stop.

Shoulders and surfaces

• Soft shoulder: the edge of the road is soft and could trap a vehicle.
• Low shoulder: the shoulder is lower than the road surface, so running off the pavement could be hazardous.
• Pavement ends: the paved surface stops ahead and becomes something else, such as gravel.

How to use this

1. Learn the shape and color table first. It answers a sign question even when you have never seen the symbol.
2. Study in pairs. Put turn next to curve and merge next to lane ends, and say the difference out loud.
3. Test yourself on our five road signs practice tests, starting with road signs test 1, 25 questions each, written from the MUTCD.
4. Then practice in your state's format. If your state has a separate signs test, such as Georgia or Virginia, take those sets too. Our guide to states with a separate road signs test lists them.
5. Read your handbook's signs chapter, for example California's traffic signals and signs or Texas's signals, signs and markers.

Source: Federal Highway Administration, Manual on Uniform Traffic Control Devices, 11th Edition with Revision 1 (December 2025), Parts 2, 3, 4, 7 and 8 (mutcd.fhwa.dot.gov); checked 1 November 2026.