Students in the United States get to school in a variety of ways. Some walk, some take public transportation such as buses or subways, some ride bikes, some high school students drive themselves, some ride special school buses, and many are driven to school by a parent or a neighbor. Bright yellow school buses are a familiar sight on American roads on school days. These buses convey millions of children to and from school every day, especially in rural areas where there is little public transportation. School buses are usually paid for by the school district a student lives in; that money comes from property taxes that all homeowners in a school district must pay. Many districts require students (or their parents) to pay some kind of fare to ride a school bus. Most school districts have rules as to how far away a child must live in order to ride a school bus. School buses are the second most used form of transportation to get a student to and from school in the United States. Many more are dropped off by a parent or older driver. The older a student gets, the less likely he or she is to ride a school bus.