Organize a carpool for work or school. Coordinate with another person or two to carpool to work or work with other parents in the neighborhood to carpool kids to school.
Carpooling will also enable you to take the High Occupancy Vehicle (HOV) lane on a highway. This lane will usually save time and money on gasoline.
If you live near your children's school, consider organizing a "walking school bus" instead of driving. Children walk to school together in groups, supervised and guided by parents. Neighborhood parents can take turns leading