Traffic signs, railroad crossings and work zones

Key points

1. When visibility is poor, you may be able to make out only a sign's shape.

   Source: Handbook p. 40

   “When visibility is poor, such as in heavy rain, dust storms, or fog, you may be able to make out only the shape of a particular sign.”
   Arizona Driver License Manual and Customer Service Guide, Handbook p. 40

2. The octagon is reserved for stop signs; you must come to a complete stop.

   Source: Handbook p. 41

   “Octagon This shape is reserved for stop signs. You must come to a complete stop.”
   Arizona Driver License Manual and Customer Service Guide, Handbook p. 41

3. A triangle means yield to cross traffic or merging traffic.

   Source: Handbook p. 41

   “Triangle This shape requires that you yield the right-of-way to cross traffic or to merging traffic.”
   Arizona Driver License Manual and Customer Service Guide, Handbook p. 41

4. A pennant marks the beginning of a no passing zone.

   Source: Handbook p. 41

   “Pennant This sign marks the beginning of a no passing zone.”
   Arizona Driver License Manual and Customer Service Guide, Handbook p. 41

5. Yellow diamond signs warn of a possible danger ahead.

   Source: Handbook p. 41

   “Yellow, diamond-shaped signs warn of a possible danger ahead.”
   Arizona Driver License Manual and Customer Service Guide, Handbook p. 41

6. A circle shaped sign warns that a railroad crossing is ahead.

   Source: Handbook p. 42

   “A circle-shaped sign provides a warning that you are approaching a railroad crossing.”
   Arizona Driver License Manual and Customer Service Guide, Handbook p. 42

7. Do not cross until all signals stop and the barricade is fully up, and never drive around or under a lowered barricade.

   Source: Handbook p. 42

   “Do not cross the tracks until all signals have stopped and the crossing barricade is up all the way. Do not drive around or under a lowered crossing barricade.”
   Arizona Driver License Manual and Customer Service Guide, Handbook p. 42

8. When a crossing warns of a train, stop no closer than 15 feet from the nearest track.

   Source: Handbook p. 42

   “stop no closer than 15 feet from the nearest railroad track when you”
   Arizona Driver License Manual and Customer Service Guide, Handbook p. 42

9. Most signs in highway and street work areas are diamond shaped.

   Source: Handbook p. 44

   “Most signs used in highway and street work areas are diamond-shaped.”
   Arizona Driver License Manual and Customer Service Guide, Handbook p. 44

Numbers to know

Recognize these signs

3 questions from the Arizona practice test

1. 1. What action does the red octagonal sign require?

   
   1. Slow down and continue if clear
   2. Stop only when another vehicle is present
   3. Yield without stopping
   4. Come to a complete stop
   Show answer

   Come to a complete stop. The octagonal shape is reserved for stop signs, and the manual requires a complete stop. A driver should not treat the sign as a yield instruction or continue merely because the intersection appears empty. The shape remains a strong recognition cue when weather, darkness, or distance makes lettering hard to read. After stopping, the driver must observe the intersection and proceed only when it is safe and permitted. The requirement is a full stop, not a rolling pause or a conditional stop based on nearby traffic.

2. 2. What right-of-way instruction is represented by the triangular sign shown?

   
   1. Yield the right-of-way to cross traffic or merging traffic
   2. Continue without yielding because the road has priority
   3. Use the sign only to identify a school crossing
   4. Come to a complete stop before moving
   Show answer

   Yield the right-of-way to cross traffic or merging traffic. A triangle is the shape reserved for a yield instruction in Arizona's sign system. It tells the driver to give the right-of-way to traffic crossing the path or merging into it, then proceed only when the movement is safe. A full stop is not automatically required merely because the sign is triangular, although stopping may be necessary to yield safely. The choice about continuing without yielding reverses the sign's purpose, while the school-crossing choice confuses sign shape with a different warning category. A useful cue is the triangle: slow, check both directions, and give other road users priority when required.

3. 3. What does a circle-shaped Arizona sign warn a driver about?

   
   1. A school crossing for children
   2. A prohibited U-turn
   3. An approaching railroad crossing
   4. A recommended curve speed
   Show answer

   An approaching railroad crossing. Arizona uses a circle-shaped warning sign to tell drivers that a railroad crossing is approaching. This is different from the rectangular regulatory signs that control traffic movement, the permanent five-sided school crossing sign, and the small yellow square that can show a safe speed for a curve. The railroad warning is an advance cue, so reduce speed, look for tracks and signals, and be prepared to stop as required. A circle does not authorize a turn or identify a general roadway direction.

Source: the Arizona Driver License Manual and Customer Service Guide, Section 3: Roadway and Vehicle Knowledge. This lesson is a plain English summary, not the law itself; where it differs, the manual and the statute govern. Last checked 2026-09-27.