Lol the internet.But not everyone has a computer at home and pen pals is old tradition(well I don't know if it is but still).
Maybe its just my school system in the area I live in but during grade school I never had a school bus pick me up from home(except pre-school).I had to walk to school or take the public bus since I didn't have a family car but I was thinking back about how in tv people have a school bus.