What signifies that a driver is under the Graduated Driver License (GDL) program?

Answer: B — They must display a GDL decal on their vehicle

The significance of displaying a GDL decal on a vehicle is that it serves as a visual indication to other road users and law enforcement that the driver is under the Graduated Driver License program. This decal is a crucial part of the GDL system as it helps in promoting safety and awareness on the road by identifying novice drivers. Such identification can lead to a more cautious driving environment, as experienced drivers can take extra care around those with less driving experience. While having a special GDL license is indeed part of the program, the decal specifically indicates the driver's current status. The restrictions on driving during certain hours or limiting the number of passengers may be specific rules associated with the GDL, but they do not serve as the primary identification of the driver's GDL status. The decal plays an essential role in recognizing the need for additional caution and awareness from all road users.