Some things that are regulated in most societies will merely be recommended in ours. However, since this recommendation requires a certain level of responsibility, the concept of a "minor" will exist in order for a recommendation to become a regulation, requiring a guardian to take responsibilty of the minor.
For example, seat belts will only be a recommendation, as the failure to wear one does not present any danger to other individuals. However, turn signals, headlights, and driving under the influence will all be regulated.
Of course, the idea of cars will hopefully be non-existant (SocietyTransit), but it serves to make an example.