Final answer:
Young drivers with an examination permit or probationary license must display decals on their vehicle. These help law enforcement identify them and enforce age-specific driving restrictions.
Step-by-step explanation:
Drivers under the age of 21, who possess an examination permit or probationary license, shall not operate a vehicle without displaying decals that identify them as new drivers, typically on the license plate. States implement these laws to increase road safety, as younger drivers are statistically more prone to accidents. They also help law enforcement easily identify new drivers who are subject to specific restrictions like zero tolerance for alcohol and certain passenger and curfew limits.