For a vehicle requiring a CDL, which attached liquid or gas tank capacities meet the federal tank-vehicle definition?
Correct answer: Each qualifying tank exceeds 119 gallons; combined capacity is at least 1,000 gallons
The federal definition uses rated tank capacity, not the quantity currently loaded, and includes permanent or temporary attachment. Its narrow exception covers an empty storage-container tank of at least 1,000 gallons that is not designed for transportation and is temporarily attached to a flatbed. An empty tank designed for transportation is not automatically exempt. Tank operation requires the applicable endorsement; hazardous cargo can require additional authorization.
Source: 49 CFR 383.5, Tank vehicle definition; 383.93(b)(3); current eCFR displayed up to date September 10, 2026; reviewed September 12, 2026 ↗
Under the federal CLP rule, what cargo restriction applies to a learner with a tank endorsement?
Correct answer: The tank must be empty and any previous hazardous-material residue purged
An N-endorsed CLP permits only an empty tank vehicle. A tank that previously contained hazardous material must be purged of residue. Other CLP conditions, including the qualified accompanying CDL holder, still apply.
Source: 49 CFR 383.25(a)(5)(iii), with supervisor condition in (a)(1); current eCFR displayed up to date September 10, 2026; reviewed September 12, 2026 ↗
Which cargo-tank defect can make it unsafe to transport a load?
Correct answer: A leaking valve or tank seam
Inspect the tank, valves, pipes, hoses and connections for leaks. Do not carry liquid or gas cargo in a leaking tank.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), 8.1.1 Leaks, printed page 8-1 (physical PDF page 1) ↗
What should a driver do after discovering that a cargo tank is leaking?
Correct answer: Do not transport cargo in it
Do not transport liquid or gas cargo in a leaking tank. Correct the leak before using the tank to carry cargo.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), 8.1.1 Leaks, printed page 8-1 (physical PDF page 1) ↗
Before loading, unloading, or moving a tank vehicle, what must be verified about its valves?
Correct answer: They are in the correct positions
Intake, discharge, and cutoff valves must be checked for leaks and set correctly for the operation.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), 8.1.1 Leaks — valves, printed page 8-1 (physical PDF page 1) ↗
What should be checked at tank manhole covers and vents?
Correct answer: Sound gaskets, correctly closed covers, clear vents
Secure gasketed covers prevent leaks, while clear vents must remain able to function.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), 8.1.1 Leaks — manhole covers and vents, printed page 8-1 (physical PDF page 1) ↗
A tanker has vapor recovery, grounding cables and emergency shutoffs. What should the driver do before operating it?
Correct answer: Check that the installed special-purpose equipment works
Vapor recovery, grounding and bonding cables, emergency shutoffs, and built-in extinguishers require inspection.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), 8.1.2 Check Special Purpose Equipment, printed page 8-1 (physical PDF page 1) ↗
Which cargo-tank condition must be corrected before travel?
Correct answer: Open discharge valve or manhole cover
Discharge valves and manhole covers must be properly closed before travel. This does not mean blocking the vents; vents must remain clear and functional.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), 8.1.2 Check Special Purpose Equipment — Caution, printed page 8-1 (physical PDF page 1) ↗
Which load characteristic contributes directly to a liquid tanker's rollover risk?
Correct answer: A high center of gravity
Much of the load weight is high above the road, making the vehicle top-heavy.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), 8.2.1 High Center of Gravity, printed page 8-2 (physical PDF page 2) ↗
How should a tanker driver approach highway, entrance-ramp, and exit-ramp curves?
Correct answer: Well below the posted curve speed
Tankers can roll even at posted curve speeds, so the driver must reduce speed well below them.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), 8.2.1 High Center of Gravity, printed page 8-2 (physical PDF page 2) ↗
What can liquid surge do after a partly filled tanker stops on a slippery road?
Correct answer: Shove the stopped vehicle forward
A moving liquid wave can strike the tank end and shove the vehicle in the wave direction.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), 8.2.2 Danger of Surge, printed page 8-2 (physical PDF page 2) ↗
When loading a tank divided into separate compartments by bulkheads, what deserves special attention?
Correct answer: Front-to-rear weight distribution
Separate compartments can overload the front or rear if their weight is distributed poorly.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), 8.2.3 Bulkheads, printed page 8-2 (physical PDF page 2) ↗
What movement do baffles primarily help control?
Correct answer: Forward-and-back liquid surge
Holes in baffles reduce longitudinal surge; dangerous side-to-side movement remains possible.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), 8.2.4 Baffled Tanks, printed page 8-2 (physical PDF page 2) ↗
Why must starts and stops be especially gentle with a smooth-bore tanker?
Correct answer: Nothing inside the tank slows the liquid flow
An unbaffled smooth-bore tank permits strong forward-and-back surge.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), 8.2.5 Unbaffled Tanks, printed page 8-2 (physical PDF page 2) ↗
Why are some food-product tanks built without baffles?
Correct answer: Baffles can make the inside difficult to clean to sanitation standards
Sanitation requirements can rule out baffles because they complicate interior cleaning.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), 8.2.5 Unbaffled Tanks, printed page 8-2 (physical PDF page 2) ↗
What does outage mean when loading a liquid cargo tank?
Correct answer: Empty space left for the liquid to expand
Liquids expand as they warm, so the tank must not be filled completely.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), 8.2.6 Outage, printed page 8-3 (physical PDF page 3) ↗
Which three factors does New York CDL manual section 8.2.7 list for deciding how much liquid to load?
Correct answer: Expansion in transit, liquid weight, and legal weight limits
Allow expansion space and respect cargo weight and legal limits. Available tank volume alone does not determine a safe load.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), 8.2.7 How Much to Load?, printed page 8-3 (physical PDF page 3) ↗
Why might a large tank be only partly filled with a dense liquid?
Correct answer: A full tank could exceed legal weight limits
Tank volume does not override weight limits; dense products can make a full tank overweight.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), 8.2.7 How Much to Load?, printed page 8-3 (physical PDF page 3) ↗
Which driving pattern is safest for a loaded tanker?
Correct answer: Smooth starts, gradual stops, gentle turns, and steady lane changes
Smooth control limits surge and rollover forces created by the high center of gravity.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), 8.3.1 Drive Smoothly, printed page 8-3 (physical PDF page 3) ↗
How should a tanker driver brake for a planned stop?
Correct answer: Brake well in advance with steady pressure and extra following distance
Early, steady braking and more following room help keep surge controlled.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), 8.3.2 Controlling Surge, printed page 8-3 (physical PDF page 3) ↗
For a tanker without ABS, which emergency braking methods does the handbook describe?
Correct answer: Controlled or stab braking
For a tanker without ABS, section 8.3.2 describes controlled or stab braking for an emergency stop. Sudden steering while braking can overturn a tanker. This question does not instruct drivers to pump functioning ABS brakes.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), 8.3.2 Controlling Surge; see also section 5.4.2–5.4.3, printed 5-11, printed page 8-3 (physical PDF page 3) ↗
What is the recommended speed-control sequence for a curve in a tank vehicle?
Correct answer: Slow before the curve, then accelerate slightly through it
Reduce to a safe speed before entering the curve, then use slight acceleration through it without exceeding a safe speed. The posted curve speed may be too fast for a tanker.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), 8.3.3 Curves, printed page 8-3 (physical PDF page 3) ↗
Which tanker may require more stopping distance than many drivers expect?
Correct answer: An empty tank vehicle
An empty tanker can need more stopping distance than a loaded one. Wet pavement further increases stopping distance; allow extra space instead of assuming an empty vehicle will stop quickly.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), 8.3.4 Stopping Distance, printed page 8-3 (physical PDF page 3) ↗
Which action can cause a tank vehicle to skid?
Correct answer: Oversteering, hard acceleration, or excessive braking
Abrupt steering, acceleration, and braking can break tire traction.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), 8.3.5 Skids, printed page 8-3 (physical PDF page 3) ↗
What can happen if the drive or trailer wheels of a tank trailer begin to skid?
Correct answer: The combination may jackknife
A skid at the drive or trailer wheels can start a jackknife, so the driver must restore wheel traction.
Source: New York State Commercial Driver's Manual CDL-10 (11/25), 8.3.5 Skids, printed page 8-3 (physical PDF page 3) ↗
