What minimum tread depth is required in the major grooves of the front tires on a commercial truck?
Correct answer: 4/32 inch
Front tires on buses, trucks and truck tractors need at least 4/32 inch in major grooves; the general minimum for other tires is 2/32 inch. Do not measure on tie bars, humps or fillets.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), section 2, 2.1.3, What to Look For > Tire Problems; printed p. 2-2, section-PDF physical page 2. Corroboration: 49 CFR 393.75(b)-(c), major-groove measurement and excluded tie bars, humps, and fillets, current through 2026-09-10. ↗
Why should you follow a consistent sequence when inspecting your commercial vehicle?
Correct answer: It reduces the chance of overlooking a component
Following the same inspection method helps you remember the checks and notice problems before driving.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), section 2, 2.1.5, Seven-step Inspection Method > Method of Inspection; printed p. 2-4, section-PDF physical page 4. ↗
What extra following time should be added when traveling above 40 mph?
Correct answer: One additional second
Apply the length rule, then add one second when speed exceeds 40 mph.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), section 2, 2.7.1, Space Ahead > How Much Space?; printed p. 2-22, section-PDF physical page 22. ↗
Under the federal cargo-inspection rule, when must the driver first recheck securement on an accessible, unsealed truck load after starting the trip?
Correct answer: Within the first 50 miles
Inspect within the first 50 miles and correct any insecure loading. Separate exceptions apply to sealed loads the driver is ordered not to open and loads that cannot practicably be inspected.
Source: 49 CFR 392.9(b)(2) and (b)(4), eCFR Title 49 current through 2026-09-10, reviewed 2026-09-12. Related NY CDL-10 (11/25), 3.1, Inspecting Cargo > After Starting, printed p. 3-1, section-PDF physical page 1: https://dmv.ny.gov/brochure/cdl10sec03.pdf#page=1 ↗
Under the federal rule for cargo tiedowns, what aggregate working load limit must they provide?
Correct answer: At least half the secured cargo's weight
The counted aggregate must be at least half the secured cargo's weight. Whether a tiedown ends at the cargo, returns to the same vehicle side or spans opposite sides affects how its rating counts; use the regulatory formula.
Source: 49 CFR 393.106(a) and (d)(1)-(3), eCFR Title 49 current through 2026-09-10, reviewed 2026-09-12. Related NY CDL-10 (11/25), 3.3.2, Cargo Tiedown; current CFR supplies counted aggregate formula, printed p. 3-3, section-PDF physical page 3: https://dmv.ny.gov/brochure/cdl10sec03.pdf#page=3 ↗
Before backing with a helper, which signal should you both agree on?
Correct answer: A clear stop signal
Keep the helper visible and agree on understood hand signals before backing. A clear stop signal is especially important.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), section 2, 2.2.4, Backing Safely > Use a Helper; printed p. 2-12, section-PDF physical page 12. ↗
You are looking 12 to 15 seconds ahead as recommended for commercial driving. How should you also monitor the nearer road?
Correct answer: Shift attention between distant and nearby conditions
Looking well ahead does not replace monitoring nearby hazards. The handbook describes shifting attention back and forth between near and far to maintain awareness.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), section 2, 2.4.1, Seeing Ahead > How Far Ahead to Look; printed p. 2-14, section-PDF physical page 14. ↗
On a straight divided highway with a clear view, what spacing does the handbook give for the three warning devices behind a stopped truck?
Correct answer: 10, 100, and 200 feet toward approaching traffic
All three warn traffic approaching from the direction serving that roadway. Adjust for an obstructed view.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), section 2, 2.5.2, Communicating Your Presence > When Parked at the Side of the Road; Figure 2.8 on printed 2-18; printed p. 2-17, section-PDF physical page 17. Corroboration: 49 CFR 392.22(b)(2)(v), divided or one-way roads. ↗
A car ahead drifts within its lane while its driver looks down repeatedly. How should you react?
Correct answer: Leave extra room and anticipate an unexpected movement
Recognizing distraction in another driver helps you protect your own space.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), section 2, 2.9.3, Watch Out for Other Distracted Drivers; printed p. 2-29, section-PDF physical page 29. ↗
A properly inflated tire’s pressure rises during hot-weather operation. Should you bleed air to its cold-pressure reading?
Correct answer: No, it could become underinflated when it cools
Heat raises pressure; follow cold-inflation specifications rather than vent hot tires.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), section 2, 2.14.1, Vehicle Checks > Tires; printed p. 2-35, section-PDF physical page 35. ↗
One train has passed a crossing with two tracks. What must you check before proceeding?
Correct answer: Whether another train is approaching on either track
A train can conceal another train. Obey warning devices and verify the crossing is clear.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), section 2, 2.15.3, Driving Procedures > Double Tracks Require a Double Check; printed p. 2-38, section-PDF physical page 38. ↗
After a collision, you are uninjured and able to act. What is an immediate priority?
Correct answer: Prevent another collision at the scene
Protect the area, request assistance, and keep emergency access clear.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), section 2, 2.20.1, Protect the Area; printed p. 2-48, section-PDF physical page 48. ↗
For a small fire you are trained to tackle safely, with the correct extinguisher and a clear escape path, where should you aim?
Correct answer: At the base of the fire
The extinguishing agent must reach the burning material rather than only the rising flames.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), section 2, 2.21.3, Fire Fighting > Extinguish the Fire; printed p. 2-50, section-PDF physical page 50. ↗
Why inspect a front-end header board before carrying a load?
Correct answer: It helps restrain forward cargo movement toward the cab
A sound front-end structure protects against cargo moving forward in a sudden stop.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), section 3, 3.3.3, Header Boards; printed p. 3-4, section-PDF physical page 4. ↗
Before moving an oversize or overweight load, what arrangements should you establish?
Correct answer: Permits, routing limits, and required warnings or escorts
A sign alone does not authorize a special load. Determine the applicable movement conditions and equipment before departure.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), section 3, 3.4.4, Oversized Loads; printed p. 3-4, section-PDF physical page 4. ↗
An approaching driver leaves bright lights on. What should you do?
Correct answer: Look toward the right edge reference without staring into the glare
Avoid adding glare or losing sight of your own lane; reduce speed when needed.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), section 2, 2.11.5, Night Driving Procedures > Avoid Glare from Oncoming Vehicles; printed p. 2-32, section-PDF physical page 32. ↗
When should you learn how to fit the chains carried for your drive tires?
Correct answer: Before encountering conditions that require them
Check fit and condition in advance so the equipment can be used correctly when required.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), section 2, 2.13.1, Vehicle Checks > Tire Chains; printed p. 2-34, section-PDF physical page 34. ↗
Does buying a cold medicine without a prescription prove it is safe before commercial driving?
Correct answer: No, it may cause drowsiness or impair driving
Check warnings and appropriate medical advice; over-the-counter availability is not a safety guarantee.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), section 2, 2.22.2, Other Drugs; printed p. 2-53, section-PDF physical page 53. ↗
A breakdown forces your truck to stop on the highway shoulder. Which lights should you switch on immediately to warn approaching traffic?
Correct answer: The four-way emergency flashers
Flashers warn that the vehicle is stopped. They do not replace the required warning devices that must also be placed promptly.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), section 2, 2.5.2, Communicating Your Presence > When Parked at the Side of the Road; printed p. 2-17, section-PDF physical page 17. ↗
A newer streamlined truck climbed a hill in a relatively high gear. Should you automatically use that same gear to descend?
Correct answer: No, the descent may require a lower gear suited to that truck and grade
Reduced drag and different engine performance can make the old same-gear rule unsuitable. Select the correct low gear before descending.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), section 2, 2.16.2, Select the Right Gear Before Starting Down the Grade; printed p. 2-40, section-PDF physical page 40. ↗
