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CDL School Bus study materials
CDL School Bus study resources

CDL School Bus: CDL Licensing and Endorsement Requirements

CDL School Bus · Work through your exam, one topic at a time.

All guide sections

CDL Licensing and Endorsement Requirements

Domain focus

The CDL Licensing and Endorsement Requirements domain tests whether you can choose the correct license class and endorsements for a school bus, and whether you understand the prerequisites that must be met before driving one. Questions often present a vehicle specification and ask what license and endorsements are required.

Class is set by weight and passenger capacity

A school bus is a CMV designed to carry 16 or more passengers, including the driver. The class depends on GVWR and configuration:

  • Class C: single vehicle with GVWR under 26,001 lb that is designed for 16+ passengers.
  • Class B: single vehicle with GVWR of 26,001 lb or more.
  • Class A: combination with a towed vehicle over 10,000 lb. A 20-passenger bus at 24,000 lb GVWR is Class C, not Class B. A 30,000 lb bus is Class B.

Endorsements stack; S is not stand-alone

  • P (passenger) is required to drive any vehicle designed for 16+ passengers.
  • S (school bus) is required in addition to P. You must hold P before or with S. S is earned by passing the school bus knowledge test and a skills test in a school bus.
  • Air brakes endorsement or knowledge is required if the bus has air brakes.
  • Medical certification: you must self-certify your operating category and carry a valid DOT medical examiner's certificate.

Entry-level and documentation points

ELDT is required for an initial Class A or B CDL, a Class C-to-B/A upgrade, and the H endorsement. It is not required merely to add P or S to an existing CDL, but a class upgrade for a larger school bus does trigger ELDT. Employers also query the Drug and Alcohol Clearinghouse before hiring.

Worked example

A driver holds a Class C CDL with P and applies to drive a 20-passenger school bus with GVWR 28,000 lb and air brakes. The bus exceeds 26,001 lb, so Class C is insufficient: the driver needs a Class B upgrade, with a skills test in a Class B vehicle and ELDT if not completed. P is already held, but S is still required, including the S knowledge test and skills test in a school bus. Air-brake knowledge is required for the air-braked bus. Medical certification must be current.

Traps

  • Assuming every school bus is Class B; many are Class C.
  • Treating S as a stand-alone endorsement; it requires P.
  • Forgetting air-brake and medical requirements.
  • Assuming ELDT is required for every endorsement addition.