Minnesota CDL — General Knowledge practice
Minnesota 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
14 questions · pass with 11 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. A round sign showing a black symbol on a yellow background posted before a set of train tracks tells a commercial driver to do what?
Correct answer: Slow down, look and listen for a train, and be prepared to stop at the tracks
The round advance-warning marker means to ease off, watch and listen for a train, and be ready to halt at the rails if one is coming.
Source: Minnesota CDL Manual — Section 2: Driving Safely (Railroad-highway Crossings)
2. What message do diamond-shaped orange signs and narrowed lanes on a highway most likely convey?
Correct answer: A roadway work zone requiring extra caution
Orange signs and narrowed, uneven lanes mark a work zone, where you should slow down, drive carefully, and watch for workers and equipment.
Source: Minnesota CDL Manual — Section 2: Driving Safely (Work Zones)
3. A blue sign mounted on a railroad crossing post or on the metal control box near the tracks provides what?
Correct answer: A 24-hour phone number to report crossing emergencies
The blue Emergency Notification System sign gives a round-the-clock phone number and the crossing's DOT number so problems at the crossing can be reported.
Source: Minnesota CDL Manual — Part A (Emergency Notification System for Highway-Rail Grade Crossings)
4. What does a crossbuck sign at a highway-rail grade crossing require of a commercial driver?
Correct answer: Yield the right-of-way to a train that is coming
The crossbuck marks the grade crossing and requires the driver to give the right-of-way to any approaching train.
Source: Minnesota CDL Manual — Section 2: Driving Safely (Warning Signs and Devices)
5. At many crossings the crossbuck sign is fitted with flashing red lights and bells. When those lights start flashing, the driver must do what?
Correct answer: Stop, because a train is coming, and yield to it
Flashing red lights warn that a train is approaching; the driver must stop and give the train the right-of-way.
Source: Minnesota CDL Manual — Section 2: Driving Safely (Flashing Red Light Signals)
6. A move-over sign posted on a highway tells a commercial driver to do what when approaching a stopped emergency vehicle?
Correct answer: Slow down and move over to a non-adjacent lane when safe
Move-over laws require drivers to slow down and, if it is safe, change into a lane that is not next to the stopped emergency vehicle or work zone.
Source: Minnesota CDL Manual — Section 2: Driving Safely (Move-Over Laws)
7. A yellow lamp located on the left side of a trailer is used to indicate what condition?
Correct answer: A malfunction in the trailer's antilock brakes
Trailers carry a yellow antilock-braking-system malfunction lamp on the left side; if it stays lit, the ABS may not be working properly.
Source: Minnesota CDL Manual — Section 2: Driving Safely (How to Know If Your Vehicle Is Equipped with ABS)
8. What color must the reflectors and marker lights be at the rear of a large vehicle?
Correct answer: Red
During the walk-around inspection, rear reflectors, marker lights, and taillights must be clean and the proper color, which is red at the rear.
Source: Minnesota CDL Manual — Section 2: Driving Safely (Walk-around Inspection)
9. On a two-lane road, an 'X' painted on the pavement together with the letters 'RR' warns a driver of what?
Correct answer: A railroad crossing is ahead, the same meaning as the advance-warning sign
Pavement markings with an X and RR carry the same message as the advance-warning sign, alerting you to a railroad crossing ahead.
Source: Minnesota CDL Manual — Section 2: Driving Safely (Pavement Markings)
10. Identification numbers shown on placards or orange panels of a bulk cargo tank are preceded by which letters?
Correct answer: 'NA' or 'UN'
The four-digit identification number that helps first responders identify the material is preceded by the letters 'NA' or 'UN'.
Source: Minnesota CDL Manual — Section 2: Driving Safely (Identification Numbers)
11. On a two-lane road approaching a railroad crossing, what does a 'no passing zone' marking mean for the driver?
Correct answer: Passing is prohibited while approaching the crossing
The no-passing marking and sign near a crossing tell drivers they may not pass other vehicles in that stretch approaching the tracks.
Source: Minnesota CDL Manual — Section 2: Driving Safely (Pavement Markings)
12. A red triangular emblem with an orange center displayed on the back of a vehicle indicates what?
Correct answer: A vehicle that by its nature moves slowly
The reflective triangle with an orange middle is the slow-moving-vehicle symbol; it marks equipment such as farm machinery or tractors that travel well below normal traffic speed.
Source: Minnesota CDL Manual — Section 2: Driving Safely (Slow Drivers)
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