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CDL · Inspecting Tank Vehicles

Why are tank vehicles required to have specific markings or specifications?

Reviewed by Jordan Morley, Editorial Lead at 247SimpleTests. Written by the 247SimpleTests Editorial Team from the official source material cited on every question.

Correct answer

Tank vehicle specifications (DOT MC 306, MC 307, MC 312, DOT 406, etc.) indicate what the tank is designed to carry, including pressure ratings and material compatibility

  1. A Only for sales purposes
  2. B Tank vehicle specifications (DOT MC 306, MC 307, MC 312, DOT 406, etc.) indicate what the tank is designed to carry, including pressure ratings and material compatibility
  3. C Markings have no significance
  4. D For decoration only

Why this is the answer

Cargo tank specifications are critical safety information. DOT MC 306 / DOT 406 tanks carry low-pressure flammable liquids like gasoline; MC 307 / DOT 407 carry chemicals and acids; MC 312 / DOT 412 carry corrosives; MC 331 carry compressed gases under high pressure; MC 338 carry refrigerated liquefied gases. Each spec has different design pressures, material compatibility, and operational rules. A tank cannot legally carry a material outside its specification class. The spec is stamped on a metal data plate on the tank and is part of the vehicle's permanent identity. Driving a tank with the wrong material is dangerous and illegal — chemistry can react with the tank itself.
Source: FMCSA CDL Manual 8.1.2 Tank Specifications

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About this topic: Inspecting Tank Vehicles

The combination-vehicle inspection adds fifth wheel, kingpin, glad hands, and trailer-specific items to the standard pre-trip routine. This is one of 14 Tanker questions on inspecting tank vehicles, each with a full explanation on a single study page.

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