During the truck walk-around, you find tire fabric visible through a cut in the sidewall. The tire still holds air. What should you conclude?
Correct answer: Holding air does not make the tire safe; the damage needs correction before use.
Exposed fabric from a tire cut or other damage is a defect to identify during inspection. Air pressure alone does not establish that a damaged tire is safe.
Source: Utah Commercial Driver License Manual, 2025 Edition / Version March 2025, 2.1.3 What to Look For - Tire Problems; physical PDF page 24. ↗
After pumping a hydraulic brake pedal, you hold steady pressure and the pedal slowly sinks. What is the appropriate response?
Correct answer: Have the possible hydraulic leak or other brake problem corrected before driving.
The manual describes holding the pedal after pumping it as a hydraulic leak check. A moving pedal during the hold indicates a problem that must be corrected.
Source: Utah Commercial Driver License Manual, 2025 Edition / Version March 2025, 2.1.5 Step 7 - Test for Hydraulic Leaks; physical PDF page 30. ↗
You must back a tall truck into an unfamiliar loading area. What should the preliminary walk-through include?
Correct answer: Ground-level obstacles, side clearance, and overhead clearance along the entire path.
Before backing, get out and inspect the path. A clear pavement surface does not establish clearance from branches, wires, canopies, or side obstructions.
Source: Utah Commercial Driver License Manual, 2025 Edition / Version March 2025, 2.2.4 Backing Safely - Look at Your Path; physical PDF page 32. ↗
A helper will watch the blind area while you back toward a dock. What must you agree on before the truck moves?
Correct answer: Clear hand signals, especially the signal that means stop.
A helper supplements the driver’s checks. Agreed signals, particularly a stop signal, prevent confusion during backing.
Source: Utah Commercial Driver License Manual, 2025 Edition / Version March 2025, 2.2.4 Backing Safely - Use a Helper; physical PDF page 32. ↗
In ordinary conditions, which scanning plan follows the CDL manual’s guidance for anticipating trouble ahead?
Correct answer: Look about 12 to 15 seconds ahead while also checking nearer traffic and the mirrors.
The manual recommends a 12-to-15-second look-ahead range. It is a scanning guide, not a reason to ignore nearby hazards or mirrors.
Source: Utah Commercial Driver License Manual, 2025 Edition / Version March 2025, 2.4.1 Seeing Ahead; physical PDF page 33. ↗
A car looks small and far away in your truck’s curved mirror. How should this affect a lane-change decision?
Correct answer: Allow for the mirror making objects appear smaller and farther away than they are.
Convex mirrors expand the field of view but distort apparent size and distance. Use the complete mirror-check routine and a genuinely safe gap.
Source: Utah Commercial Driver License Manual, 2025 Edition / Version March 2025, 2.4.2 Seeing to the Sides and Rear - Using Mirrors; physical PDF page 34. ↗
A loaded truck approaches a curve with a posted advisory speed commonly used by cars. What is the safest plan?
Correct answer: Reduce speed before entering; the posted curve speed may still be too fast for the truck.
A truck’s load and center of gravity affect its safe curve speed. Slow before the curve instead of relying on a speed suitable for a passenger car.
Source: Utah Commercial Driver License Manual, 2025 Edition / Version March 2025, 2.6.3 Speed and Curves; physical PDF page 38. ↗
Your headlights reveal less clear roadway than the distance your truck needs to stop. What adjustment is needed?
Correct answer: Slow enough to stop within the roadway you can see is clear.
Do not drive faster than the available sight distance permits. Darkness, hills, curves, and weather can all shorten the clear distance ahead.
Source: Utah Commercial Driver License Manual, 2025 Edition / Version March 2025, 2.6.4 Speed and Distance Ahead; physical PDF page 38. ↗
Under good conditions, a 40-foot commercial vehicle is traveling at 55 mph. What following interval matches the manual’s length-and-speed guideline?
Correct answer: At least five seconds.
The manual recommends one second per 10 feet of vehicle length below 40 mph, plus one additional second above 40 mph. Forty feet at 55 mph gives five seconds; adverse conditions require more.
Source: Utah Commercial Driver License Manual, 2025 Edition / Version March 2025, 2.7.1 Space Ahead, physical PDF pages 39-40; physical PDF page 39. ↗
The truck starts to hydroplane across standing water. Which response helps the tires regain contact?
Correct answer: Ease off the accelerator and avoid hard braking or abrupt steering.
Hydroplaning reduces tire contact with the road. Ease off power and let the vehicle slow without abrupt inputs; the manual also discusses disengaging the clutch where applicable.
Source: Utah Commercial Driver License Manual, 2025 Edition / Version March 2025, 2.6.2 Matching Speed to the Road Surface - Hydroplaning; physical PDF page 38. ↗
The pavement is wet on a cold day, but a bridge ahead looks unusually dry and dark. What should you allow for?
Correct answer: The bridge may be icy even though nearby pavement is only wet.
Bridges can freeze before other road surfaces, and ice may not be obvious. Make smooth control inputs and reduce speed before reaching a suspect surface.
Source: Utah Commercial Driver License Manual, 2025 Edition / Version March 2025, 2.6.2 Matching Speed to the Road Surface - Bridges; physical PDF page 38. ↗
You are approaching an icy stretch with the retarder switched on. What does the CDL manual recommend?
Correct answer: Turn the retarder off when traction is poor.
Retarders act through the drive wheels and can cause a skid on slippery surfaces. The manual advises turning them off in poor-traction conditions.
Source: Utah Commercial Driver License Manual, 2025 Edition / Version March 2025, 2.3.4 Retarders; physical PDF page 33. ↗
