Final answer:
Vehicle placards are used to identify the associated company, assess hazardous situations, and provide information for First Responders, not for tracking which is done by other technologies.
Step-by-step explanation:
The correct answer is Option D: All the Above.
Vehicle placards are used for multiple purposes: (a) to quickly identify the company associated with a vehicle, (b) to quickly assess any hazardous situation that may arise from transporting dangerous goods, and (c) to allow First Responders to approach a scene with the knowledge needed for appropriate action. They do not serve the purpose of tracking vehicles for law enforcement or toll collection, which is done using other technologies such as cameras, transponders, and GPS. In the context of tollbooths, a piece of wire in the pavement is not for placarding, but rather intended to alert the booth of an approaching vehicle for toll collection or traffic monitoring purposes.
They display important information about the vehicle's contents or potential dangers. In addition, vehicle placards can also help quickly identify the company by displaying its logo or name.