School buses are specifically used to transport children, teenagers or adults to school and from school or back and forth between school and special events. School bus services are not the same as public bus services, but rather a school bus is designed only to serve a specific school or a specific school system. There are a number of different companies that create school bus vehicles for this purpose, including Thomas and Blue Bird for example. School buses in the United States are distinctly painted yellow and are known for having a number of safety devices built in.