CDL School Bus Endorsement Study Guide 2026

The school bus endorsement

The S endorsement needs a knowledge test and a skills test. In many states, such as Washington and Illinois, the school bus knowledge test has 20 questions, and you need 80% (16 correct). Since February 7, 2022, a first S endorsement also needs entry-level driver training from a registered provider. A CLP holder with an S endorsement may not drive a school bus with passengers on board. Your state may add its own rules, such as background checks.

Danger zones

A danger zone is any area around the bus where children are most at risk of being hit, by another vehicle or by their own bus.

Area	How far the danger zone extends
In front of the bus	Up to 30 feet from the front bumper; the first 10 feet are the most dangerous
Left side	10 feet from the side; always dangerous because cars may pass
Right side	10 feet from the side
Behind the bus	10 feet from the rear bumper

Mirrors

Correctly adjusted mirrors are vital. Check each one before you drive and have it fixed if needed. View the crossover, convex and flat mirrors in a set order so you know no child is in a danger zone.

Flat and convex side mirrors on a large vehicle. A school bus has the same two types on each side, plus crossover mirrors at the front corners.

Left flat mirror: a long, narrow view along the side and the lane beside it.
Left convex mirror: a wider but shorter view.
Right flat mirror.
Right convex mirror.

Mirror	Adjust it to see
Outside flat mirrors (left and right)	200 feet or 4 bus lengths behind the bus, along the sides, and the rear tires touching the ground
Outside convex mirrors	The entire side up to the mirror mounts, the front of the rear tires touching the ground, and at least one traffic lane on each side
Crossover mirrors	The whole area in front of the bus from the bumper at ground level to where you can see directly, the front tires, and the area to the service door
Overhead inside mirror	The top of the rear window at the top of the mirror, and all students, including the heads of those right behind you

Convex and crossover mirrors make people and objects look smaller and farther away than they are. The flat mirrors have a blind spot behind the bus that is usually 50 to 150 feet and can reach 400 feet. The inside mirror cannot show the area right behind your seat or the area behind the rear bumper.

Loading and unloading

Getting on and off the bus is when students are closest to the danger zones, so follow these steps every time. Follow your state and district rules where they differ.

Approaching the stop

Approach slowly and check all mirrors again and again.
Turn on the alternating amber lights at least 200 feet, or about 5 to 10 seconds, before the stop (or as your state requires).
Turn on the right turn signal about 100 to 300 feet before pulling over.
Move as far right as you can and stop with the front bumper at least 10 feet from the waiting students.
Put the transmission in Park (or Neutral) and set the parking brake.
When traffic is a safe distance away, turn on the red lights and extend the stop arm.
Check that all traffic has stopped before fully opening the door and signaling students to come.

Loading

Students wait in a set place, facing the bus, and board only when you signal.
Count the students and know their names if you can. Students board one at a time using the handrail. Keep the dome light on in the dark.
Wait until everyone is seated and facing forward before moving.
Before pulling away, close the door, engage the transmission, release the parking brake, turn off the red lights, turn on the left signal, check all mirrors, and let traffic clear.

Unloading and crossing students

Students stay seated until you tell them to get off, then walk at least 10 feet from the side of the bus to a place where you can see them.
A student who must cross walks to a spot at least 10 feet in front of the right corner of the bumper, then stops at the edge of the road where you can see their feet.
The student looks both ways and waits for your signal before crossing, then keeps looking for traffic while crossing.
If you missed a stop, never back up. Follow your district's procedure.
If you cannot account for a student, secure the bus, take the key, and check around and under the bus.
At school, turn off the engine and take the key if you leave your seat, then walk through the bus to check for sleeping or hiding students.

Hidden dangers

Teach students that if they drop something near the bus, they should leave it, move away from the bus, and get your attention. Clothing, bags and straps can catch in the handrail or door, so watch every student until they are safely away.

Post-trip inspection

After each route, walk through and around the bus. Look for items left behind, sleeping students, open windows and doors, and problems with the mirrors, warning lights and stop arm.

Emergency evacuation

In most emergencies, students are safer on the bus. You must evacuate when:

The bus is on fire or there is a danger of fire.
The bus is stalled on or next to a railroad crossing.
The bus may shift into a more dangerous position.
A collision is about to happen.
A hazardous materials spill makes a quick evacuation necessary.

Situation	Where students should go
Most emergencies	At least 100 feet off the road, in the direction of oncoming traffic
Fire	Upwind of the bus
Railroad crossing	As far from the tracks as possible, toward any oncoming train
Hazardous materials spill	At least 300 feet upwind
Tornado with no building nearby	A ditch or culvert far enough away that the bus cannot fall on them; lie face down with hands over heads

Decide whether evacuating is safest, and choose the exits to use.
Secure the bus: Park or Neutral, parking brake on, engine off, key out, hazard lights on.
If there is time, tell dispatch where you are and what help you need.
Order the evacuation. Older student helpers (two per exit, when possible) assist, and another leads the group to safety.
Do not move a student with a possible neck or back injury unless their life is in danger.
Walk through the bus to make sure no one is left, and take emergency equipment.
Join the students, count them, set out warning devices, and prepare information for responders.

Railroad crossings

School buses generally must stop at every railroad crossing. At a passive crossing there are no signals, so the decision is entirely yours. Active crossings have flashing lights, with or without bells and gates.

Slow down, test your brakes, and turn on the hazard lights about 200 feet before the crossing.
Stop no closer than 15 feet and no farther than 50 feet from the nearest rail. Keep the front of the bus behind any white stop line.
Put the bus in Park (or Neutral) and hold the brakes. Turn off radios and noisy equipment and quiet the students.
Open the service door and the driver's window. Look and listen for trains.
At multiple tracks, stop only before the first one. Cross in a low gear and do not change gears on the tracks.

If the gate comes down after you start across, keep going, even if you break the gate.
If the gate stays down after a train passes, do not drive around it. Call your dispatcher.
Know your bus length. You need room on the far side for the bus plus 15 feet. If it won't fit, don't commit.
Obey a police officer directing traffic at a crossing.

Student management

Never deal with a problem on the bus while students are getting on or off. Keep your attention outside the bus, and handle the problem once they are safely away. For a serious problem, park safely off the road, secure the bus and take the key, then speak calmly and firmly. You may move the student to a seat near you.

Never put a student off the bus anywhere except at school or the student's own stop. If the behavior is too dangerous for you to drive safely, call a school administrator or the police.