CDL Testing and Knowledge Requirements
This domain tests how a Nebraska CDL applicant earns the school bus authorization. Questions focus on which written tests are required, what the S endorsement knowledge test covers, and how the skills test must be conducted.
Required written tests
- The general knowledge test for the CDL class you need (A, B, or C).
- The passenger (P) endorsement knowledge test.
- The school bus (S) endorsement knowledge test.
- The air brakes knowledge test when the bus has air brakes; otherwise an air-brake restriction remains.
- Combination knowledge test only if the vehicle configuration requires it.
What the S knowledge test emphasizes
- Loading and unloading students, including the student crossing in front of the bus.
- Danger zones around the bus and proper mirror use.
- Stop arm, red flashing lights, and crossing gate operation.
- Railroad crossing procedures specific to school buses.
- Emergency exits, evacuation, and student management.
- Post-trip inspection and checking for sleeping students.
Worked example
A driver holds a Class B CDL with a P endorsement and applies for S. The driver passes the S knowledge test but takes the skills test in a Class B passenger coach that has no stop arm, school bus mirrors, or crossing gate. The S endorsement is not issued. The skills test must be taken in a school bus representing the vehicle to be driven. If that bus has air brakes and the driver has an air-brake restriction, the restriction must be removed first.
Traps that cost marks
- Assuming a P endorsement also authorizes school bus operation. P and S are separate.
- Treating a passed knowledge test as authorization to drive before the skills test is passed.
- Using a non-school-bus test vehicle and expecting the S endorsement.
- Ignoring the air-brake restriction on an air-brake-equipped bus.
- Memorizing warning-light rules without knowing loading and unloading steps.