A driver is required to carry an ERG (or equivalent) when:
Correct. Whenever hazmat is being transported, the driver must have access to current ERG information for the materials in question.
CDL Practice Question #247
Category: Hazmat
Why this question matters
This question is one of 68 in our Hazmat bank. The reasoning above comes directly from the AAMVA CDL Manual, the source document used by every U.S. state DMV. Memorizing the underlying rule — not just the letter answer — is what separates passing on the first attempt from a return trip and another fee.