You inspect a different tractor this morning. What approach makes an omitted safety item less likely?
Correct answer: Follow the same systematic inspection sequence each time
A consistent inspection sequence helps you cover every required area. Familiarity or a clean appearance does not show that the vehicle is safe.
Source: Washington Commercial Driver Guide, N/10/20; section 2.1.5, physical PDF 31, printed 2-3. ↗
During a truck walk-around, rusty streaks lead away from several wheel nuts. What do they suggest?
Correct answer: The nuts may be loose and need their tightness checked
Rust around wheel nuts can signal movement from looseness. Check the wheel fastening condition rather than treating the streaks as merely cosmetic.
Source: Washington Commercial Driver Guide, N/10/20; section 2.1.3, physical PDF 30, printed 2-2. ↗
A damaged exhaust connection is allowing fumes near your truck cab. Why does it need attention before the trip?
Correct answer: Exhaust can enter the cab or sleeper and poison occupants
A leaking exhaust system can carry poisonous fumes into occupied areas. Repair the defect; closing off the sleeper is not protection from fumes.
Source: Washington Commercial Driver Guide, N/10/20; section 2.1.3, physical PDF 31, printed 2-3. ↗
Your trip paperwork and a heavy tool are lying loose beside the pedals. What should you do before moving?
Correct answer: Stow them securely so they cannot obstruct the controls
Loose cab objects can interfere with pedals or strike someone during a sudden stop. Secure them before starting.
Source: Washington Commercial Driver Guide, N/10/20; section 2.1.5, physical PDF 35, printed 2-7. ↗
During the guide's stationary hydraulic-brake check, the pedal continues to sink under firm pressure. What is the appropriate response?
Correct answer: Have the brake problem corrected before driving
A pedal that moves while held firmly can indicate a leak or another hydraulic fault. This is a defect to correct before operating, not a normal warm-up condition.
Source: Washington Commercial Driver Guide, N/10/20; section 2.1.5, physical PDF 35, printed 2-7. ↗
For a truck subject to 49 CFR 393.75, which pair gives the minimum major-groove tread depths for front tires and other tires?
Correct answer: 4/32 inch at the front; 2/32 inch on the other tires
Measure major grooves, excluding tie bars, humps and fillets. These are minimum depths, not a guarantee that a tire with other damage is safe.
Source: 49 CFR 393.75(b)-(c); tread depth and measurement exclusions. ↗
A truck tire has adequate tread depth but its tread is separating from the casing. Can it be used for the planned highway trip?
Correct answer: No; tread separation makes the tire unacceptable for operation
The tire rule separately prohibits tread or sidewall separation. Adequate remaining tread does not cure that defect.
Source: 49 CFR 393.75(a)(2); tread or sidewall separation. ↗
Your truck's safety belt latches, but the webbing is badly frayed. Which conclusion is correct?
Correct answer: The belt needs attention; latching alone does not make it sound
The inspection includes the mounting, adjustment, latch and webbing. A ripped or frayed belt is not made serviceable just because its buckle clicks.
Source: Washington Commercial Driver Guide, N/10/20; section 2.1.5, physical PDF 32, printed 2-4. ↗
Your drive tires begin spinning as you accelerate a heavy truck on a slick surface. How should you respond?
Correct answer: Ease off the accelerator to reduce wheelspin
Excess power can overwhelm the available traction. Reduce it, then use smooth, gradual acceleration suited to the surface.
Source: Washington Commercial Driver Guide, N/10/20; section 2.2.1, physical PDF 36, printed 2-8. ↗
Two safe approaches to a loading area are available. Why is backing toward the driver's side generally preferred?
Correct answer: It provides a better view of the vehicle's rear path
Driver-side backing improves visibility, including the view through the side window. Both mirrors and checks of the whole path still matter.
Source: Washington Commercial Driver Guide, N/10/20; section 2.2.4, physical PDF 36, printed 2-8. ↗
Before reversing under a loading canopy, you cannot judge its clearance from the cab. What should you do?
Correct answer: Stop, get out and check the planned path and overhead space
Check the full backing route, including overhead and side clearance, before moving. If uncertain during the maneuver, stop and check again.
Source: Washington Commercial Driver Guide, N/10/20; section 2.2.4, physical PDF 36, printed 2-8. ↗
A helper is about to guide your truck into a bay. What must the two of you agree on before backing?
Correct answer: A clear set of signals, especially the signal to stop
Both people need to understand the signals before the truck moves. The helper must be visible to the driver; a stop signal is particularly important.
Source: Washington Commercial Driver Guide, N/10/20; section 2.2.4, physical PDF 36, printed 2-8. ↗
