Final answer:
The driving hours of a GDL Examination Permit or Probationary License holder under 21 are typically restricted as a safety measure, similar to other legal age restrictions such as those established by the National Minimum Drinking Age Act of 1984. States set specific rules for young drivers, influenced by federal incentives and organizations like MADD.
Step-by-step explanation:
The driving hours of a Graduated Driver Licensing (GDL) Examination Permit or Probationary License holder under 21 are typically restricted to prevent novice drivers from driving during high-risk periods. Although specifics can vary by state, generally, these restrictions include not driving late at night and sometimes not during early morning hours. These laws are a form of legal discrimination, sanctioned due to safety concerns, much like other age-based regulations such as the National Minimum Drinking Age Act of 1984, which insists on a minimum drinking age of twenty-one to discourage irresponsible alcohol consumption and related injuries or deaths, particularly those that may result from intoxicated driving. Much like the federal government can influence state laws regarding the drinking age through financial incentives, state governments can set specific rules for young drivers to promote road safety. An example of societal influence on such laws is the role played by MADD, who lobbied for the National Minimum Drinking Age Act.