Why is dropping the wheels of a tall truck onto a low shoulder especially dangerous near roadside signs?
Correct answer: The truck may lean toward a sign or another overhead obstacle.
An edge drop-off can tilt the vehicle. The top of a tall truck may move toward a sign, branch or other obstacle even when the tires miss it. Keep the whole vehicle's clearance in mind.
Source: ALEA Commercial Driver's License Manual, posted 160-page PDF, Section 2 body version July 2017; 2.8.2 Hazardous Roads / Drop Off; printed page 2-19, physical PDF page 41; reviewed September 22, 2026. ↗
A box is lying in your truck's lane. You cannot tell what is inside. What is the safest assumption?
Correct answer: It may contain a heavy object capable of damaging the vehicle.
Do not treat an unknown box as harmless. Debris can damage tires, wheels and other parts, including lines beneath a vehicle. Look for a safe response without a sudden unplanned swerve.
Source: ALEA Commercial Driver's License Manual, posted 160-page PDF, Section 2 body version July 2017; 2.8.2 Hazardous Roads / Foreign Objects; printed page 2-19, physical PDF page 41; reviewed September 22, 2026. ↗
While approaching a stopped transit bus, which hidden hazard should a truck driver anticipate?
Correct answer: A person stepping into the road from in front of the bus.
A large stopped vehicle can hide people who enter the road. Slow and remain prepared for a pedestrian to appear; do not assume that leaving a bus means a person has seen your truck.
Source: ALEA Commercial Driver's License Manual, posted 160-page PDF, Section 2 body version July 2017; 2.8.3 Drivers Who Are Hazards / stopped buses; printed page 2-19, physical PDF page 41; reviewed September 22, 2026. ↗
A parked car's reverse lights come on as your truck approaches. What should you prepare for?
Correct answer: The car may back into your path.
Lights, moving front wheels and other visible activity can warn that a parked vehicle may enter your path. Treat them as a reason to prepare, not as proof that its driver has seen you.
Source: ALEA Commercial Driver's License Manual, posted 160-page PDF, Section 2 body version July 2017; 2.8.3 Drivers Who Are Hazards / Parked Vehicles; printed page 2-19, physical PDF page 41; reviewed September 22, 2026. ↗
A nearby car drifts within its lane while its driver repeatedly looks down. What should you do?
Correct answer: Allow extra room and be ready for an unexpected movement.
Drifting and diverted attention can indicate distraction. Increase your margin for an unpredictable movement rather than relying on the other driver to notice you or signal reliably.
Source: ALEA Commercial Driver's License Manual, posted 160-page PDF, Section 2 body version July 2017; 2.9.7 Other Distracted Drivers; printed page 2-23, physical PDF page 45; reviewed September 22, 2026. ↗
A driver cannot recall the last several miles and has missed an exit. What is the safest interpretation?
Correct answer: Fatigue may be affecting awareness and requires a safe stop.
Missing recent driving memories or signs can be a fatigue warning. The driver should safely stop and address the need for rest, not use another vehicle as a substitute for alertness.
Source: ALEA Commercial Driver's License Manual, posted 160-page PDF, Section 2 body version July 2017; 2.11.2 Driver Factors / Warning Signs of Fatigue; printed page 2-25, physical PDF page 47; reviewed September 22, 2026. ↗
Why should a driver avoid darkly tinted glasses when driving at night?
Correct answer: They reduce the light available for seeing hazards.
Night driving already offers less visual information. Dark lenses reduce available light further. Do not try to solve glare by making the whole scene darker.
Source: ALEA Commercial Driver's License Manual, posted 160-page PDF, Section 2 body version July 2017; 2.11.5 Night Driving Procedures / eyeglasses; printed page 2-27, physical PDF page 49; reviewed September 22, 2026. ↗
Headlight glare seems worse through a windshield with an oily film inside. What should you do before another night trip?
Correct answer: Clean both the inside and outside glass surfaces.
Dirt and film can scatter light and worsen glare. Cleaning inside and outside glass, along with mirrors and lights, helps preserve the limited visibility available at night.
Source: ALEA Commercial Driver's License Manual, posted 160-page PDF, Section 2 body version July 2017; 2.11.4 Vehicle Factors / Windshield and Mirrors; printed page 2-27, physical PDF page 49; reviewed September 22, 2026. ↗
Why is following the vehicle ahead's taillights an unreliable way to navigate dense fog?
Correct answer: That vehicle may stop or leave the roadway without you realizing it.
Do not blindly follow lights through fog. The other vehicle may be stopped or may have left the roadway. Maintain your own awareness of the road and a safe distance.
Source: ALEA Commercial Driver's License Manual, posted 160-page PDF, Section 2 body version July 2017; 2.12 Driving in Fog; printed page 2-27, physical PDF page 49; reviewed September 22, 2026. ↗
Before entering a stretch of very dense fog, you can safely reach a truck stop. What is the safer option if visibility is inadequate?
Correct answer: Wait at the truck stop until conditions improve.
When possible, avoid driving in dense fog by waiting in a safe location such as a truck stop or rest area. A roadside stop can expose the truck to vehicles whose drivers cannot see it in time.
Source: ALEA Commercial Driver's License Manual, posted 160-page PDF, Section 2 body version July 2017; 2.12 Driving in Fog; printed page 2-27, physical PDF page 49; reviewed September 22, 2026. ↗
Which preparation helps keep the windshield usable in freezing conditions?
Correct answer: Check the defroster, wipers and freeze-protected washer supply.
Winter preparation includes a working defroster, suitable wipers and washer fluid protected against freezing. Do not start relying on equipment before confirming it can keep your view clear.
Source: ALEA Commercial Driver's License Manual, posted 160-page PDF, Section 2 body version July 2017; 2.13.1 Vehicle Checks; continuation on physical page 50 / Wipers and Washers; printed page 2-27, physical PDF page 49; reviewed September 22, 2026. ↗
Snow and ice cover a truck's steps and handholds. What should happen before using them?
Correct answer: Clear them so you have secure footing and a reliable grip.
Winter inspection includes clearing snow and ice from steps and handholds. Secure access reduces the risk of a fall; jumping or relying on eventual melting is not a sound substitute.
Source: ALEA Commercial Driver's License Manual, posted 160-page PDF, Section 2 body version July 2017; 2.13.1 Vehicle Checks / Hand Holds, Steps, and Deck Plates; printed page 2-28, physical PDF page 50; reviewed September 22, 2026. ↗
No train horn is audible as you approach a crossing. What can you safely conclude?
Correct answer: Nothing about whether a train is approaching; look and listen.
Train horns may not sound at some crossings, and cab noise can mask them. Silence is not permission to cross. Check the tracks and obey the warning devices and applicable stop rules.
Source: ALEA Commercial Driver's License Manual, posted 160-page PDF, Section 2 body version July 2017; 2.15.3 Driving Procedures / Do Not Expect to Hear a Train; printed page 2-31, physical PDF page 53; reviewed September 22, 2026. ↗
Your vehicle is stuck at a crossing and everyone is safely away from the tracks. What information on the blue-and-white ENS sign helps you alert the railroad?
Correct answer: Its emergency telephone number and crossing identification number.
Call the railroad emergency number on the ENS sign, give the crossing identification number and describe the emergency. The ID pinpoints the crossing for the railroad; do not rely on a guessed location or return to the vehicle to make the call.
Source: Federal Railroad Administration, Emergency Notification Systems at Highway-Rail Grade Crossings; In Case of Emergency, Use ENS Signs To Get Help; updated April 4, 2025; reviewed September 22, 2026. General crossing-emergency guidance, not an Alabama exam specification. ↗
Your truck is gaining speed on a steep descent because its brakes have failed. An escape ramp is ahead. What should guide your decision?
Correct answer: Use the available ramp rather than delay while speed builds.
Escape ramps are intended to help stop runaway vehicles. Know their locations and use an available ramp when brakes fail rather than letting the truck gather more speed while searching for a less inconvenient option.
Source: ALEA Commercial Driver's License Manual, posted 160-page PDF, Section 2 body version July 2017; 2.17.3 Brake Failure / Brake Failure on Downgrades; printed page 2-34, physical PDF page 56; reviewed September 22, 2026. ↗
A driver says a heavily loaded truck can always descend a hill in the same gear it used to climb. Is that a reliable rule for modern trucks?
Correct answer: No. Engine and braking characteristics can require a lower descent gear.
The handbook warns against relying on the old same-gear rule for every truck. Select the appropriate low gear before descending, considering the vehicle and grade rather than applying a universal uphill-to-downhill shortcut.
Source: ALEA Commercial Driver's License Manual, posted 160-page PDF, Section 2 body version July 2017; 2.16.2 Select the Right Gear before Starting Down the Grade; printed page 2-32, physical PDF page 54; reviewed September 22, 2026. ↗
A truck's front tires have lost grip and it continues straight despite steering input. Will turning the wheel much farther solve the skid?
Correct answer: No. Reduce the excessive speed or braking input so traction can return.
In a front-wheel skid, the tires cannot provide the requested steering force. More steering alone does not restore grip. Ease the excessive input causing the skid and slow as safely as possible.
Source: ALEA Commercial Driver's License Manual, posted 160-page PDF, Section 2 body version July 2017; 2.19.3 Front-wheel Skids; printed page 2-37, physical PDF page 59; reviewed September 22, 2026. ↗
You stop to help at a crash and can choose a safe place to park. Why should you stay clear of the immediate crash area?
Correct answer: Emergency vehicles need access and another collision must be avoided.
Protect the area from further collisions without blocking responders. Park safely away from the immediate scene, warn traffic as appropriate and provide the location when calling for help.
Source: ALEA Commercial Driver's License Manual, posted 160-page PDF, Section 2 body version July 2017; 2.20.1 Protect the Area; printed page 2-38, physical PDF page 60; reviewed September 22, 2026. ↗
Smoke indicates a truck fire and the vehicle can still be stopped safely. Which location is preferable?
Correct answer: An open area away from buildings, brush and other vehicles.
Stop off the road in a suitable open area when possible, away from things that can catch fire, and notify emergency services. A fuel station is an especially unsuitable place to take a burning vehicle.
Source: ALEA Commercial Driver's License Manual, posted 160-page PDF, Section 2 body version July 2017; 2.21.3 Fire Fighting / Pull Off the Road; printed page 2-38, physical PDF page 60; reviewed September 22, 2026. ↗
After stopping safely for an engine fire, what should you avoid?
Correct answer: Opening the hood and feeding the fire with more air.
Stop the engine as soon as you can safely do so. Avoid opening the hood, which can supply oxygen and intensify a fire. Prioritize getting clear and contacting emergency services over attempting risky access.
Source: ALEA Commercial Driver's License Manual, posted 160-page PDF, Section 2 body version July 2017; 2.21.3 Fire Fighting / Keep the Fire from Spreading; printed page 2-38, physical PDF page 60; reviewed September 22, 2026. ↗
