Which federal regulation makes it the motor carrier's own responsibility to route a hazmat shipment around tunnels, heavily populated areas, and narrow streets whenever a practicable alternative exists?

49 CFR 397.71, Federal standards for state/tribal NRHM routing designations

49 CFR 177.823, Placarding requirements

49 CFR 392.10, Railroad-highway grade crossings

Driving, Parking & Emergency Response Test 1/2

✓

Correct!

Correct. For carriers not already subject to a state or tribal NRHM routing designation under this subpart, 49 CFR 397.67(b) directs them to select routes that avoid tunnels, heavily populated areas, places where crowds assemble, and narrow streets or alleys, except where no practicable alternative exists, a reasonable deviation is needed to reach a terminal or get food/fuel/rest, or an emergency requires it. Subsection (c) adds that 'operating convenience is not a basis' for ignoring this duty.

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Not quite.

Wrong. 397.71 sets the federal standards that states and Indian tribes must follow when they create their own NRHM (non-radioactive hazardous materials) routing designations, it governs how a state may restrict a specific tunnel, not the carrier's own day-to-day routing duty.

The correct answer is A: 49 CFR 397.67, Motor carrier responsibility for routing.

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Not quite.

Wrong. 177.823 establishes when a vehicle must be placarded at all; it defines applicability, not where a placarded vehicle may or may not drive.

The correct answer is A: 49 CFR 397.67, Motor carrier responsibility for routing.

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Not quite.

Wrong. 392.10 governs mandatory stops at railroad-highway grade crossings and has nothing to do with tunnel routing.

The correct answer is A: 49 CFR 397.67, Motor carrier responsibility for routing.