The tank shell appears sound. Where else must you look for possible cargo leakage?
Correct answer: At pipes, hoses, connections and especially their joints.
A sound-looking shell does not rule out a leaking connection. Inspect under and around the vehicle and pay close attention to joints, hoses, piping and valves.
Source: Washington Commercial Driver Guide, N/10/20; section 8.1.1; physical PDF 107, printed 8-1. ↗
A tank vent appears obstructed. Which response follows the guide's inspection advice?
Correct answer: Have the obstruction corrected so the vent can function as designed.
Keep the specified vents clear and functional. Do not improvise by plugging them or driving with an unsecured cover; use the tank's approved maintenance and operating procedures.
Source: Washington Commercial Driver Guide, N/10/20; section 8.1.1; physical PDF 107, printed 8-1. ↗
A required built-in emergency shutoff fails its prescribed check. What is the appropriate decision before loading?
Correct answer: Correct the defect and verify the system before the operation.
Emergency equipment needs to function before it is needed. A different valve or reduced load does not by itself establish that a failed required safety system can be disregarded.
Source: Washington Commercial Driver Guide, N/10/20; section 8.1.2; physical PDF 107, printed 8-1. ↗
A ramp's posted curve speed looks comfortable in a car. How should a tanker driver use that information?
Correct answer: Choose a lower safe entry speed; the posted value may be too fast for the tanker.
The guide warns that tankers can overturn at posted curve speeds. Reduce speed before the curve and account for the tank, load and road conditions rather than treating the sign as a guaranteed safe target.
Source: Washington Commercial Driver Guide, N/10/20; section 8.2.1; 8.3.3 on physical 108; physical PDF 107, printed 8-1. ↗
A tank is divided into separate compartments by bulkheads. What needs attention as individual compartments are loaded or emptied?
Correct answer: Weight distribution so neither end of the vehicle becomes overloaded.
Separate compartments do not automatically produce a balanced load. Loading or unloading one part changes the distribution, so avoid concentrating too much weight at the front or rear.
Source: Washington Commercial Driver Guide, N/10/20; section 8.2.3; physical PDF 108, printed 8-2. ↗
Compared with a baffled tank, what handling concern is especially strong in a smooth-bore liquid tank?
Correct answer: Forward-and-back liquid surge during starting and stopping.
A smooth-bore tank lacks internal baffles to slow lengthwise liquid flow. Start and stop especially gently. The cargo's movement still depends on the tank, fill level and driving conditions.
Source: Washington Commercial Driver Guide, N/10/20; section 8.2.5; physical PDF 108, printed 8-2. ↗
Why might a dense liquid reach the permitted load limit before the tank reaches its volume capacity?
Correct answer: Its weight can reach a legal limit while unused tank space remains.
Cargo volume and cargo weight are different constraints. Dense liquids may require a partial load to stay within weight limits, and the necessary expansion space must still be provided.
Source: Washington Commercial Driver Guide, N/10/20; section 8.2.7; physical PDF 108, printed 8-2. ↗
A tank combination's drive wheels or trailer wheels start skidding after abrupt control inputs. What major risk does the guide identify?
Correct answer: The combination can jackknife if traction is not restored.
Avoid oversteering, overaccelerating and overbraking. A skid at the drive or trailer wheels can develop into a jackknife; use the appropriate traction-restoring response for the cause and the vehicle's braking equipment.
Source: Washington Commercial Driver Guide, N/10/20; section 8.3.5; physical PDF 108, printed 8-2. ↗
A CDL-required commercial truck has a fixed 1,500-gallon cargo tank carrying 600 gallons of nonhazardous liquid. Does the partial load alone remove it from Washington's tank-vehicle definition?
Correct answer: No; the definition uses rated tank capacity, not this trip's liquid volume.
The tank exceeds the individual and aggregate rated-capacity thresholds. Neither the smaller current load nor the nonhazardous product alone excludes this CMV from the definition.
Source: RCW 46.25.010(22), rated-capacity definition; official text reviewed September 13, 2026. ↗
A CMV flatbed carries an empty 2,000-gallon storage tank, not designed for transportation, temporarily attached for delivery. How does the cited guidance treat this specific case?
Correct answer: It is excluded from the tank-vehicle definition described in the guidance.
This specific empty-storage-tank situation is excluded. That does not waive ordinary CDL, securement or other applicable duties, or mean every empty cargo tanker is exempt.
Source: FMCSA, 49 CFR 383.5 Guidance Q&A 9, effective March 7, 2019; official text reviewed September 13, 2026. ↗
