The "License Plate Game" is a popular road trip activity where players try to spot license plates from different states or regions. Participants keep track of the plates they see, often using a list or a map to mark off each state. The goal is to find as many unique plates as possible during the journey. Players can compete individually or in teams, and the game can be made more challenging by setting time limits or adding specific rules, such as finding plates with certain letters or numbers. This game encourages observation and can make long drives more entertaining for families and friends.