Where can the hazardous material inquiry code be found?

The hazardous material inquiry code is found inside the vehicle on a circular placard. This is crucial for emergency responders who need to quickly identify the type of hazardous materials being transported in case of an accident or spill. The placard serves as a visible indicator, allowing for rapid assessment and response to potential hazards.

In contrast, other options do not provide this specific information. While a driver's license and vehicle registration documents contain important vehicle and driver information, they do not include details about hazardous materials. Similarly, the vehicle’s manual might provide some specifications or safety information but does not typically include the hazardous material inquiry code. Therefore, the circular placard inside the vehicle is the correct location for this code, directly linking it to safety and regulatory compliance for transporting hazardous materials.