What type of containers generally utilize placards for identification?

Bulk containers utilize placards for identification because they are typically used to transport large quantities of hazardous materials. The regulation of hazardous materials transport requires that bulk containers, which can include tanks, trailers, or large boxes, display placards to clearly indicate the nature of their contents. This is crucial for safety and emergency response, as it allows first responders to quickly identify the type of substance present, assess potential hazards, and take appropriate action.

In contrast, small packages for consumer use, standard shipping boxes, and vehicle storage compartments may not require such prominent identification methods due to the smaller, less hazardous amounts they typically contain or their means of usage. The focus on bulk containers is a matter of ensuring safety in handling large quantities that could pose significant risks if not properly identified.