School Buses: At ATS we strive to provide you with the safest possible transportation. Our economical "school bus" fleet is SPAB (Student Pupil Activity Bus) certified by, and inspected regularly, by the CHP, as are 75% of ATS drivers. This means that ATS coaches, and drivers, must meet and pass the very stringent rules and regulations set forth by the California State Board of Education to carry our most precious passengers: California students K-12 grades. ATS SPAB certification also applies to our "over the road" Luxury Coaches