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When law enforcement stops and inspects a vehicle transporting hazardous materials, one of their primary functions is to check the shipping papers and vehicle placards. Shipping papers, also known as bills of lading, contain crucial information about the hazardous materials being transported, including the proper shipping name, UN number, and specific handling procedures. This information is vital for ensuring that the materials are being transported in compliance with federal regulations and to assess the potential risks associated with the load in case of an accident.

Vehicle placards are also critical as they provide visual notifications about the type of hazardous materials being carried. These placards help inform emergency responders in case of an incident, guiding them on how to safely approach and manage the situation.

In contrast, while law enforcement may observe a driver’s skills indirectly during a stop, their focus is not primarily on driving proficiency; inspecting fuel efficiency and emissions is more relevant to environmental regulations rather than HAZMAT compliance; and checking vehicle insurance documents is not specific to the transport of hazardous materials, although it may be a standard procedure in other circumstances.