In October of 2011, Pennsylvania joined a growing number of states by enacting a scheme of Graduated Driver Licensing (GDL). The legislation limits the number of passengers inexperienced drivers may carry. It also requires drivers under 18 years of age and their passengers under 18 to use seat belts / passenger restraints.
For drivers under 18, seat belt use is now mandatory. It is not a secondary offense. Read more about the new GDL Laws.