Which items should a commercial driver monitor during a trip for signs of trouble?
Correct answer: Gauges and the vehicle through sight, sound, smell, and feel
Trip inspection includes watching gauges and using the senses to detect developing problems.
Source: Texas DL-7C, March 2026, section 2–3, PDF page 28: Vehicle inspection ↗
Which warning equipment is a standard option for a parked commercial vehicle?
Correct answer: Three red reflective warning triangles
Commercial emergency equipment includes approved warning devices such as three red reflective triangles.
Source: Texas DL-7C, March 2026, section 2–3, PDF page 30: Emergency equipment ↗
Under the handbook length rule below 40 mph, what is the minimum following time for a 50-foot commercial vehicle?
Correct answer: 5 seconds
The basic minimum is one second per 10 feet of vehicle length: five seconds for 50 feet. Leave more space when road, traffic, or weather conditions require it.
Source: Texas DL-7C, March 2026, section 2–3, PDF page 43: Following distance ↗
Who is responsible for recognizing an overload or poorly balanced cargo?
Correct answer: The driver
The driver is responsible for inspecting the cargo and recognizing overloads, imbalance, and insecure loading.
Source: Texas DL-7C, March 2026, section 2–3, PDF page 73: Cargo inspection ↗
What can result from placing too little weight on the front axle?
Correct answer: The steering axle may be too light for safe steering
Insufficient front-axle weight can reduce steering control.
Source: Texas DL-7C, March 2026, section 2–3, PDF page 74: Cargo balance ↗
While backing slowly, you become unsure whether the right rear corner will clear an obstacle. What is the safest next step?
Correct answer: Stop, secure the vehicle and get out to check the path
If you are unsure of the path or clearance, stop and check it from outside the vehicle. Mirrors have blind spots, and moving slowly does not make uncertain clearance safe.
Source: Texas DL-7C, March 2026, section 2–3, PDF page 36: Backing visibility ↗
Before a trip with a trailer, which position allows an accurate check of mirror adjustment?
Correct answer: With the tractor and trailer aligned straight
Check mirror adjustment before the trip with the trailer straight. Showing part of your own vehicle provides a reference for judging other objects in the mirrors.
Source: Texas DL-7C, March 2026, section 2–3, PDF page 38: Mirror adjustment ↗
Your commercial vehicle must stop on the highway shoulder. How soon must required emergency warning devices be placed?
Correct answer: Within 10 minutes
Use flashers immediately and place the required warning devices promptly.
Source: Texas DL-7C, March 2026, section 2–3, PDF page 39: Roadside warning ↗
When is the best time to program the route into your navigation system?
Correct answer: Before beginning to drive
Plan and set up navigation before moving rather than divide attention in traffic.
Source: Texas DL-7C, March 2026, section 2–3, PDF page 51: Distraction ↗
After water enters a truck’s brakes, what behavior can occur?
Correct answer: Weak, uneven, or grabbing brake action
Water can change braking behavior and contribute to wheel lock or pulling.
Source: Texas DL-7C, March 2026, section 2–3, PDF page 56: Wet brakes ↗
How should a manual-transmission truck cross railroad tracks?
Correct answer: Select an appropriate gear before crossing and do not shift on the tracks
Avoid a missed shift or loss of movement where a train could approach.
Source: Texas DL-7C, March 2026, section 2–3, PDF page 59: Railroad crossings ↗
Excessive braking has locked the rear drive wheels of a truck without effective ABS intervention. What is the first recovery action?
Correct answer: Stop braking so the wheels can roll again
Restore rolling traction before completing the steering correction. This is not normal ABS braking advice.
Source: Texas DL-7C, March 2026, section 2–3, PDF page 64: Skid recovery ↗
Smoke comes from a closed box trailer, and the cargo may be hazardous. Should you open its doors to investigate?
Correct answer: No, keep them closed and summon emergency help
Opening the doors can rapidly feed a cargo fire; unknown hazardous cargo adds further danger.
Source: Texas DL-7C, March 2026, section 2–3, PDF page 66: Cargo fires ↗
What does bracing between upper cargo and the compartment structure help prevent?
Correct answer: Movement of the load
Bracing is part of the load-restraint system, not a substitute for inspections.
Source: Texas DL-7C, March 2026, section 2–3, PDF page 74: Cargo bracing ↗
How can live animals affect trailer stability?
Correct answer: Their movement can shift the center of gravity
Moving livestock remains a handling concern even when the load is contained.
Source: Texas DL-7C, March 2026, section 2–3, PDF page 75: Livestock cargo ↗
Why does the handbook advise turning a retarder off on a slippery road?
Correct answer: Its drive-wheel braking can cause a skid
A retarder acts through the drive wheels; reduced grip can make that braking unsafe.
Source: Texas DL-7C, March 2026, section 2–3, PDF page 37: Retarders ↗
Why should you avoid using another vehicle’s taillights as your only guide through fog?
Correct answer: That vehicle may be stopped off the roadway
Identify your own road path and leave enough distance rather than blindly following lights.
Source: Texas DL-7C, March 2026, section 2–3, PDF page 55: Fog guidance ↗
A truck tire fails, but there is no immediate collision ahead. What is the initial response?
Correct answer: Hold the steering firmly and avoid braking until speed falls
Control the vehicle first, then brake gently and stop safely for an inspection.
Source: Texas DL-7C, March 2026, section 2–3, PDF page 62: Tire failure ↗
A hot engine has a see-through coolant reservoir with level markings. How can you check the level without opening the hot system?
Correct answer: Read the level through the reservoir wall while leaving the pressure cap closed
A sight glass or transparent reservoir allows a visual check. Never open a hot pressurized cooling system.
Source: Texas DL-7C, March 2026, section 2–3, PDF page 57: Coolant-level inspection ↗
Before adding the separate air-brake lag factor where applicable, which three distances make up the handbook’s basic stopping-distance model?
Correct answer: Perception, reaction and braking distances
The vehicle moves while you recognize a hazard, while you respond and while the brakes slow it to a stop. Air brakes add a separate lag distance.
Source: Texas DL-7C, March 2026, section 2–3, PDF page 41: Stopping-distance components ↗
