Every day hundreds of thousands of Arizona children ride yellow school buses to and from school or on field trips. Parents and students assume the school buses are safe, regardless of where they live or how long the ride.

But an investigation by The Arizona Republic found that almost three out of every 10 school buses failed safety inspections conducted by the state last year because of a “major defect.”

We analyzed thousands of records, talked to dozens of people and wrote several stories to examine what that means. We built a searchable database so you can search your school district’s failure rates and find out why specific buses failed inspections.