Which feature identifies a MC 307/DOT 407 tanker?

Which feature identifies a MC 307/DOT 407 tanker?

• A. Elliptical rear
• B. Single manhole assembly protected by a flash box and roll-over protection
• C. Exposed fittings
• D. Dome on top

Answer: (B)

Recognizing MC 307/DOT 407 tankers comes down to top-access design and safety features. These non‑pressurized liquid cargo tanks have a single manhole assembly on the top, and that manhole is protected by both a flash box and rollover protection. The flash box helps contain and reduce the risk of ignition from any vented vapors, while the rollover protection guards the manhole assembly in a rollover, preventing damage and leaks. This combination is a distinctive identifying feature of MC 307/DOT 407 tankers. Other features listed, like an elliptical rear, exposed fittings, or a dome on top, aren’t unique to this tanker type and aren’t reliable identifiers.

Recognizing MC 307/DOT 407 tankers comes down to top-access design and safety features. These non‑pressurized liquid cargo tanks have a single manhole assembly on the top, and that manhole is protected by both a flash box and rollover protection. The flash box helps contain and reduce the risk of ignition from any vented vapors, while the rollover protection guards the manhole assembly in a rollover, preventing damage and leaks. This combination is a distinctive identifying feature of MC 307/DOT 407 tankers. Other features listed, like an elliptical rear, exposed fittings, or a dome on top, aren’t unique to this tanker type and aren’t reliable identifiers.