The CDL under-the-hood engine inspection test adds 3-4 days of training for a skill school bus drivers never use on the job

To drive a school bus, you need a Class B Commercial Driver's License with both a Passenger (P) and School Bus (S) endorsement. The CDL skills test includes a pre-trip inspection component where applicants must lift the hood of a school bus and identify engine parts and their functions — items like the air compressor, power steering pump, water pump, and alternator. This requirement was designed for long-haul truckers who break down on remote highways and need to diagnose mechanical issues. School bus drivers operate in urban and suburban areas with maintenance depots, and are explicitly told not to perform their own engine repairs. Yet this test adds an average of 3-4 additional days of training time. Those 3-4 days are the difference between a candidate completing training and dropping out. The full CDL-B training program takes 40-80 hours depending on the state and whether the candidate already holds a license. The under-the-hood component is consistently cited as the most intimidating and failure-prone section for prospective school bus drivers, many of whom are retirees, stay-at-home parents, or career changers with no mechanical background. When candidates fail the skills test, they must wait and retest, adding weeks. Many simply give up. The FMCSA issued a waiver allowing states to skip the engine compartment component of the pre-trip inspection skills test for school bus and passenger endorsement applicants. But only 12 states have adopted the waiver: Florida, Iowa, Kansas, Maine, Maryland, Mississippi, New Jersey, New York, Oklahoma, Pennsylvania, Texas, and Wisconsin. Texas has used the exemption over 600 times since 2024. The remaining 38 states still require it. The waiver is opt-in and temporary, not a permanent regulatory fix. The reason it persists is that CDL testing is governed by federal FMCSA regulations that treat all commercial vehicles the same, whether it is an 18-wheeler crossing the country or a school bus driving 15 miles. Separating school bus licensing from freight licensing would require federal legislation, which moves slowly — the SCHOOL BUS Act was only introduced in Congress in April 2025.