Part of fulfilling the responsibilities and duties of citizenship is following the social contract of your community. One of the guidelines in the social contract of your community might include driving in accordance with the local speed limit or keeping your pet spayed or neutered. Maintaining either of these parts of your social contract will "secure the common good". Driving the speed limit assures the safety of yourself, your passengers, and other drivers and pedestrians on the street and sidewalk. Spaying or neutering your pet will prevent your pet from wandering into busy traffic or running away, and prevents unwanted offspring from bothering your neighbors.
