Maryland School Bus Study Guide
This page covers the School Bus portion of the CDL exam as administered by the Maryland Motor Vehicle Administration in Maryland. The endorsement code is S. Below you'll find what's tested, focused study notes, and a direct link to a 25-question Maryland-specific practice test.
Take the MD School Bus Practice Test →
What's on the test
- Loading and unloading procedures and the danger zone
- Pre-trip inspection items unique to school buses
- Use of student management techniques
- Emergency exit procedures and student evacuation
- Railroad-highway grade crossing procedures (stop required)
- Use of mirrors (left, right, convex, crossover)
- Required post-trip inspection (sleeping-child check)
- Driving in unique environments (parking lots, school zones)
Study notes
Most school-bus fatalities are loading/unloading, not crashes.
The "danger zone" is a 10-foot perimeter on all sides of the stopped school bus, and the most dangerous spot of all is the area directly in front of the bus where a child can be hit by the bus they just got off. The S endorsement test focuses heavily on the procedures that minimize this risk.
Use mirrors in a deliberate sequence.
Before opening the door, scan the left flat and convex mirrors, then the crossover mirror in front of the bus, then the right flat and convex mirrors, then the door. Then re-scan as students are loading or unloading. The point is to see every part of the danger zone before any movement.
Stop and listen at every railroad crossing — same rule as P.
Stop 15 to 50 feet from the nearest rail, open the door, turn off the radio and any noisy fans, and listen and look in both directions. Do not shift gears while crossing. Cross only when you can clear the rails completely without stopping on them.
Emergency evacuation is a real test topic.
You should be able to recite the situations that require evacuating the bus (fire, danger of fire, hazardous-material spill, the bus is in the path of a train, the bus position may shift in a way that puts students in danger). Pick the most knowledgeable older student to lead, evacuate from the door away from the danger, and account for every student.
The post-trip child-check is federally required.
At the end of every route, walk to the back of the bus and check every seat for sleeping or hidden students, then activate the child-check alarm if your bus has one. This is one of the most common quiz questions, and "I check the mirrors from my seat" is a wrong answer.
Maryland-specific notes
In Maryland, the School Bus knowledge exam is one of several written tests administered at Maryland Motor Vehicle Administration CDL testing offices. Most applicants take it on the same day as the General Knowledge test. The vocabulary and question style match the official Maryland CDL handbook closely, which is why we recommend reading the relevant chapter of the handbook in addition to working through our practice tests. Pay particular attention to the chapter's "key terms" sidebars — those are almost always the source of vocabulary-style multiple-choice questions on the real exam.
If your test vehicle is equipped with air brakes, you must additionally pass the Air Brakes knowledge test or the air-brake portion will be removed from your license as an L-restriction. The skills test (vehicle inspection, basic control, and on-road) is administered by Maryland Motor Vehicle Administration examiners or by approved third-party testers. Bring your CLP, your medical certificate, and proof of insurance for the test vehicle.
A handful of Maryland-specific quirks worth knowing: the office may require a separate appointment for the skills test versus the knowledge test; many Maryland testing offices do not allow rental commercial vehicles for the skills test; and you generally need to wait at least one business day between failed attempts on the same knowledge exam (your office may extend that further on subsequent failures).
Test-day strategy
Read every question twice. CDL exam writers love to insert a single qualifier — "always," "never," "only," "primary" — that flips the right answer. When two answers look almost identical, pay attention to the verb (is it "must," "should," or "may"?), and to any numbers (14 days, 100 air miles, 8 hours). On endorsement tests in particular, watch for trick framing where a true statement about a different endorsement is offered as the "correct" answer.
Don't second-guess yourself. Your first instinct is correct on roughly 70% of CDL knowledge questions, and changes most often turn a right answer into a wrong one. Mark the questions you're unsure of, finish the rest of the exam quickly, then go back and reconsider only the marked questions with the time you have left.