Which of the following is a required element under the TDGA's six requirements for transporting dangerous goods?

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Hazard communication during transport is essential. The TDG framework requires that dangerous goods be clearly identified and communicated to anyone who might handle or encounter them, so responders can act quickly and safely in an emergency. Placing placards that indicate the product and its hazard class is the primary way this information is conveyed on the vehicle and packaging. That visibility and identifiability is what allows drivers, other road users, and first responders to recognize the risk even at a distance.

The option that mentions placards with product identification directly satisfies this requirement by providing a visible, standardized signal of what is being carried. Other options don’t fulfill this specific communication need: a safety lecture for drivers is a form of training but not the distinct labeling/placarding requirement; customer signatures are not a TDG‑mandated element for transporting dangerous goods; and a waste disposal plan relates to waste management rather than the transport hazard identification framework.