What can rust around a commercial vehicle’s wheel nuts indicate?
Correct answer: The nuts may be loose
Rust trails around wheel nuts can be evidence of movement and looseness.
Source: Florida Commercial Driver's License Manual (July 2022), section 2.1.3, printed p. 2-2, physical PDF page 28: Wheel and rim problems ↗
When should a commercial driver select the proper low gear for a downgrade?
Correct answer: Before starting down the grade
The gear must be selected before descending because shifting later may be unsafe or impossible.
Source: Florida Commercial Driver's License Manual (July 2022), section 2.6.6, printed p. 2-15, physical PDF page 41: Speed on downgrades ↗
Why might an empty cargo van require more overhead clearance than the same van when loaded?
Correct answer: Its suspension may sit higher when empty
Removing cargo can raise the vehicle, so a clearance that worked while loaded may no longer be sufficient.
Source: Florida Commercial Driver's License Manual (July 2022), section 2.7.4, printed p. 2-17, physical PDF page 43: Space overhead ↗
What does a single vehicle’s gross vehicle weight rating (GVWR) represent?
Correct answer: Its manufacturer-specified loaded weight rating
GVWR is a rating specified by the manufacturer, not the actual scale reading for a particular trip.
Source: Florida Commercial Driver's License Manual (July 2022), section 3.2.1, printed p. 3-1, physical PDF page 71: Gross vehicle weight rating ↗
Why should a driver check cargo covers in the mirrors while traveling?
Correct answer: A loose cover can tear away, expose cargo, or block someone's view
A flapping cover can detach and create a visibility or roadway hazard.
Source: Florida Commercial Driver's License Manual (July 2022), section 3.3.4, printed p. 3-3, physical PDF page 73: Covering cargo ↗
You are approaching a curve in a commercial vehicle with a manual transmission. When should you reduce speed and select the appropriate lower gear?
Correct answer: Before entering the curve
Slow to a safe speed and select the proper gear before the curve. This helps you maintain stable control rather than needing a gear change during the turn.
Source: Florida Commercial Driver's License Manual (July 2022), section 2.3.1, printed p. 2-9, physical PDF page 35: Downshifting before curves ↗
Before departure, why should you secure loose tools and other articles in the cab?
Correct answer: They can obstruct controls or strike occupants during a collision
Loose articles can interfere with vehicle controls or become impact hazards. Secure them before driving rather than relying on their current resting position.
Source: Florida Commercial Driver's License Manual (July 2022), section 2.1.5, printed p. 2-7, physical PDF page 33: Step 6 — secure loose cab articles ↗
At dusk in rain, are identification and clearance lights alone sufficient to make your truck visible?
Correct answer: No, use headlights too
Clearance lamps do not replace headlights in reduced visibility.
Source: Florida Commercial Driver's License Manual (July 2022), section 2.5.2, printed p. 2-12, physical PDF page 38: When it is hard to see ↗
Snow covers the truck’s mirrors and side windows before departure. What is required for a safe start?
Correct answer: Clear them as well as the windshield
You need usable views around the vehicle before entering traffic.
Source: Florida Commercial Driver's License Manual (July 2022), section 2.13.1, printed p. 2-28, physical PDF page 54: Winter checks — windows and mirrors ↗
When is it safe to open the pressurized radiator system for a coolant check?
Correct answer: After it has cooled, following the vehicle’s instructions
Hot pressurized coolant can cause severe burns. Engine shutdown alone does not release that danger.
Source: Florida Commercial Driver's License Manual (July 2022), section 2.14.1, printed p. 2-29, physical PDF page 55: Engine coolant ↗
Why is listening for a horn alone an unsafe crossing check?
Correct answer: Some trains do not sound a horn and cab noise may mask it
Use active observation and obey crossing controls rather than rely on sound alone.
Source: Florida Commercial Driver's License Manual (July 2022), section 2.15.3, printed p. 2-31, physical PDF page 57: Do not rely on train horns ↗
Smoke indicates a vehicle fire while you are driving. Where should you stop if you can safely move off the road?
Correct answer: In an open area away from fuel stations and combustible surroundings
Stop safely away from things that could ignite and notify emergency services.
Source: Florida Commercial Driver's License Manual (July 2022), section 2.21.3, printed p. 2-38, physical PDF page 64: Fire response — pull off the road ↗
A B:C extinguisher is intended for which hazards?
Correct answer: Flammable-liquid and electrical fires
Match the rating to the fire; do not assume one extinguisher covers every material.
Source: Florida Commercial Driver's License Manual (July 2022), section 2.21.3; Figure 2.20, printed p. 2-39, physical PDF page 65: B:C extinguishers ↗
What makes a dry-bulk tank load demanding in a sharp curve?
Correct answer: A high center of gravity and possible load movement
Reduce speed before curves and avoid abrupt maneuvers.
Source: Florida Commercial Driver's License Manual (July 2022), section 3.4.1, printed p. 3-3, physical PDF page 73: Dry bulk ↗
Your load is within the legal maximum. Does that guarantee it is safe for bad weather or a mountain route?
Correct answer: No, conditions can require operating below legal maximum weight
Legal limits do not replace judgment about braking, traction, and the route.
Source: Florida Commercial Driver's License Manual (July 2022), section 3.2.2, printed p. 3-2, physical PDF page 72: Legal weight limits and operating conditions ↗
Your eyelids are heavy and you are struggling to stay alert. What is the safe response?
Correct answer: Stop at a safe place and sleep
Temporary stimulation does not replace sleep or make continued drowsy driving safe.
Source: Florida Commercial Driver's License Manual (July 2022), section 2.11.2; 2.11.5, printed pp. 2-26, 2-27, physical PDF pages 52, 53: Drowsiness and stopping to sleep ↗
Your truck’s brakes have failed on a downgrade and an escape ramp is available. What should you do?
Correct answer: Use the escape ramp rather than pass it hoping to regain braking
A designated escape ramp offers a means to stop a runaway vehicle; delay increases danger.
Source: Florida Commercial Driver's License Manual (July 2022), section 2.17.3, printed p. 2-34, physical PDF page 60: Brake failure on downgrades ↗
Why must a commercial driver keep hazardous-material shipping papers readily accessible?
Correct answer: Responders may need to identify the cargo when the driver cannot speak
Accessible cargo information helps emergency personnel choose suitable precautions.
Source: Florida Commercial Driver's License Manual (July 2022), section 2.23.2, printed p. 2-42, physical PDF page 68: Hazardous-material shipping information ↗
A freight container is designed to transfer between a truck chassis, a train and a ship. What kind of container is it?
Correct answer: An intermodal container
Intermodal means the container can be used across two or more transport modes; the cargo still needs appropriate securement.
Source: Florida Commercial Driver's License Manual (July 2022), section 3.3.5, printed p. 3-3, physical PDF page 73: Containerized loads across transport modes ↗
Why check the rated capacity of a coupling device before assigning a load?
Correct answer: It has limits on the weight it can pull or carry
A coupling has its own rated limit for weight pulled or carried. Check that rating along with the vehicle, axle, tire and applicable legal limits.
Source: Florida Commercial Driver's License Manual (July 2022), section 3.2.1, printed p. 3-1, physical PDF page 71: Coupling-device capacity ↗
