School Busing

My elementary school was weird. Half of the students lived really close by, so they walked to school. The other half lived really far away, like 10-15 minutes by car, so they were bused to school. It’s strange because there are other students who lived closer to it than I did (I was a buser) that went to other schools, and there were other schools that were closer to where I lived, but I didn’t go there. I’m guessing it was an equalization type thing. Is my school the only one that did this?