Wyoming CDL — General Knowledge practice
Wyoming CDL — General Knowledge: Road Signs practice test
Learn the shapes, colors, and meanings of regulatory, warning, and guide signs — from stop and yield to construction and school-zone signs.
Content reviewed against official driver handbooks · August 12, 2026
13 questions · pass with 10 correct. You get instant feedback and an explanation after every answer.
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12 sample Road Signs questions with the correct answer, a short explanation, and the official handbook reference. Read through them, then take the quiz above.
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1. Which offense on the CDL list of railroad-highway grade crossing violations involves traffic control devices?
Correct answer: Disobeying a traffic control device, or an enforcement official's directions, at the crossing
One of the six crossing offenses applies to all drivers: not obeying a traffic control device at the crossing or the directions of an enforcement official there.
Source: Wyoming Commercial Driver License Manual — Section 1.3.5, Railroad-highway Grade Crossing Violations
2. In the manual's placard figure, which two placards both carry the class number 3?
Correct answer: FLAMMABLE and COMBUSTIBLE
Figure 2.25 shows a 3 on both the FLAMMABLE placard and the COMBUSTIBLE placard. FLAMMABLE SOLID shows 4, CORROSIVE 8 and RADIOACTIVE 7.
Source: Wyoming Commercial Driver License Manual — Section 2.23.3, Lists of Regulated Products
3. Four gas placards appear in the manual's placard figure: FLAMMABLE GAS, NON-FLAMMABLE GAS, OXYGEN and POISON GAS. Which class number do they all show?
Correct answer: 2
Each of the four gas placards in Figure 2.25 carries the number 2, the class the manual's hazard class table gives to gases.
Source: Wyoming Commercial Driver License Manual — Section 2.23.3, Lists of Regulated Products
4. On the road test, the driver of a vehicle displaying placards should be ready to follow the stop procedure at every railroad crossing, with one exception. What is it?
Correct answer: When the crossing is exempt
Section 13 says drivers of buses, school buses and placarded vehicles should be prepared to carry out the stop procedure at each railroad crossing unless that crossing is exempt.
Source: Wyoming Commercial Driver License Manual — Section 13.1.8, Railroad Crossing
5. In the manual's placard figure, which division numbers appear on the OXIDIZER and ORGANIC PEROXIDE placards?
Correct answer: OXIDIZER 5.1; ORGANIC PEROXIDE 5.2
Figure 2.25 shows the OXIDIZER placard with 5.1 and the ORGANIC PEROXIDE placard with 5.2.
Source: Wyoming Commercial Driver License Manual — Section 2.23.3, Lists of Regulated Products
6. What does the manual say about the speed limit posted for a curve?
Correct answer: Never go faster than it, and slow below it as needed
The manual tells drivers to slow to a safe speed before a curve and never to exceed the limit posted for it. It notes that top-heavy trucks have rolled over in tests at the posted speed.
Source: Wyoming Commercial Driver License Manual — Section 2.6.3, Speed and Curves
7. The manual's placard figure includes two EXPLOSIVES placards. Which division numbers do they show?
Correct answer: 1.1 and 1.6
The two EXPLOSIVES placards pictured in Figure 2.25 are marked 1.1 and 1.6.
Source: Wyoming Commercial Driver License Manual — Section 2.23.3, Lists of Regulated Products
8. During the road test the examiner asks you about a traffic sign on the route. What must you be prepared to do?
Correct answer: Identify the sign and explain it
The road test section says that, when asked, you should be ready to identify any traffic sign that may appear on the route and explain it to the examiner.
Source: Wyoming Commercial Driver License Manual — Section 13.1.9, Bridge/Overpass/Sign
9. May a vehicle displaying hazardous materials placards be used for a Wyoming CDL skills test?
Correct answer: No; placarded vehicles are not allowed for skills testing
Wyoming's skills test rules say placarded vehicles may not be used. The test vehicle has to represent the class of license applied for, be legally registered and meet minimum safety standards.
Source: Wyoming Commercial Driver License Manual — Wyoming Specific CDL Information, Required Tests
10. Which class number do the POISON and HARMFUL placards share in the manual's placard figure?
Correct answer: 6
Both the POISON placard and the HARMFUL placard in Figure 2.25 are marked with a 6, the class the hazard class table gives to poisons.
Source: Wyoming Commercial Driver License Manual — Section 2.23.3, Lists of Regulated Products
11. You need information about interstate Federal Motor Carrier Safety Regulations and hazmat placarding. Whom does Wyoming's manual tell you to contact?
Correct answer: The Wyoming office of the U.S. Department of Transportation
The manual sends questions on interstate federal safety regulation and hazmat placarding to the U.S. Department of Transportation office in Wyoming. Intrastate questions go to the Wyoming State Highway Patrol.
Source: Wyoming Commercial Driver License Manual — Wyoming Specific CDL Information, For Further Information
12. On the urban/rural straight portion of the road test, how should your speed relate to traffic and to the posted limit?
Correct answer: Keep pace with traffic without going over the posted speed limit
This segment expects you to stay centered in the right-most lane and keep pace with other traffic, but never above the posted limit.
Source: Wyoming Commercial Driver License Manual — Section 13.1.3, Urban/Rural Straight
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