Final answer:
Pilot vehicles must be marked with appropriate signs to alert other drivers of an oversized load, and they can lead or follow the load depending on the situation.
Step-by-step explanation:
Pilot vehicles play a critical role in ensuring road safety when oversized vehicles or loads are being transported. The correct behavior of a pilot vehicle about an oversized vehicle or load is to be marked as a pilot vehicle with appropriate signs. It is not required for the pilot vehicle to always precede the oversized vehicle; it can also follow behind. Its primary function is to alert other road users to the presence of an oversized load, and the specific positioning (leading or following) can vary depending on the situation or jurisdictional regulations. Importantly, pilot vehicles help manage traffic and increase safety by signaling to other drivers the need to be cautious when approaching or overtaking the oversized load.