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Exam Review

Key Facts: MO CDL School Bus Exam

20

Questions on the School Bus Written Exam

Missouri CDL Manual, Section 14

21 Years

Minimum School Bus Driver Age

RSMo § 302.272

10 & 30 ft

Side/Rear & Front Danger Zones

Missouri CDL Manual Section 10.1

15 to 50 ft

Railroad Crossing Stop Distance

RSMo § 304.030

500 ft

Amber Lights Before a Designated Stop

5 CSR 30-261.010

5 Points

Driver Penalty for Passing Stopped Bus

RSMo § 302.302

Missouri's CDL School Bus (S) written test has 20 multiple-choice questions, requires 80% (16 correct), and is given in English only under § 302.720.2(1) RSMo. Drivers must be at least 21 (RSMo § 302.272). Key rules: the front danger zone can extend 30 feet from the bumper, railroad stops are 15 to 50 feet from the nearest rail (RSMo § 304.030), and Missouri's DESE rule has drivers switch on amber warning lights at least 500 feet before a designated stop.

Sample MO CDL School Bus Practice Questions

Try these sample questions to review concepts for the MO CDL School Bus exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 200+ question experience with AI tutoring.

1Under Missouri Revised Statutes § 302.272, what is the minimum age required to qualify for a school bus endorsement?
A.21 years of age
B.19 years of age
C.18 years of age
D.25 years of age
Explanation: RSMo § 302.272 specifically mandates that an applicant must be at least 21 years of age to obtain or hold a school bus endorsement in the State of Missouri.
2Under section 302.272 RSMo, whose school bus endorsement application may the Director of Revenue refuse to issue or renew?
A.An applicant who has held a CDL for less than five years
B.An applicant whose record shows a suspension, revocation, disqualification, or history of moving violations
C.An applicant who lives outside the school district that will employ them, unless the district grants a written waiver
D.An applicant who has never driven a Class A vehicle
Explanation: Section 302.272.2 RSMo says the Director of Revenue shall not issue or renew a school bus endorsement for an applicant whose driving record shows that their privilege to operate a motor vehicle has been suspended, revoked, or disqualified, or shows a history of moving violations. The Missouri CDL Manual adds that school bus applicants must meet additional driver history edits under 12 CSR 10-24.160.
3Under Missouri law, what applies to a school bus endorsement holder who is 75 or older?
A.They are disqualified from driving a school bus once they reach 75
B.They must retake the written School Bus test every year
C.They must pass the skills test every two years (pre-trip waived) and get a two-year license
D.They must take a full skills test every year, including the pre-trip inspection, to keep the endorsement
Explanation: Section 302.272.1 RSMo (as amended effective August 28, 2025) requires drivers 75 or older to complete the school bus examination, excluding the pre-trip inspection portion of the skills test, every two years to keep the endorsement, and section 302.735.4 provides a biennial license. The Department of Revenue's school bus FAQ says the license and skills test fees are waived for these renewals, though a $9.00 office processing fee still applies.
4Which two commercial license endorsements are required to operate a school bus designed to transport 16 or more passengers in Missouri?
A.School Bus (S) and Tanker (N) endorsements
B.Passenger (P) and Doubles/Triples (T) endorsements
C.School Bus (S) and Hazardous Materials (H) endorsements
D.Passenger (P) and School Bus (S) endorsements
Explanation: The Missouri Department of Revenue's school bus FAQ says that to add a school bus endorsement you pass the written tests for a CDL with passenger vehicle (P) and school bus (S) endorsements, hold a CLP for at least 14 days, and pass a skills test in a school bus of the same vehicle group you will drive.
5Under Missouri Revised Statutes § 304.050, what lettering size is legally required for the words 'SCHOOL BUS' on the front and rear of the bus?
A.At least 8 inches high
B.At least 6 inches high
C.At least 4 inches high
D.At least 12 inches high
Explanation: RSMo § 304.050 requires every school bus to display plainly visible signs containing the words 'SCHOOL BUS' in letters not less than eight inches in height on both the front and rear of the vehicle.
6What rear warning sign must be displayed on the back of school buses in Missouri pursuant to RSMo § 304.050?
A.'Caution: This Vehicle Makes Frequent Stops'
B.'State Law: Stop while bus is loading and unloading'
C.'Do Not Pass on Right While Lights Flash'
D.'Stay Back 500 Feet'
Explanation: RSMo § 304.050 explicitly requires that the rear of every school bus carry a sign stating 'State Law: Stop while bus is loading and unloading' in plainly visible lettering.
7Under RSMo § 304.050, what restriction is placed on school bus drivers when discharging children on a highway having four or more lanes?
A.Drivers must escort every child across all four lanes by hand
B.Children may only be discharged on four-lane highways during daylight hours
C.Drivers may not discharge children so that they must cross more than two lanes
D.School buses are completely prohibited from traveling on highways with four or more lanes
Explanation: RSMo § 304.050 prohibits school bus drivers from discharging pupils on four-or-more-lane highways in a manner that requires children to cross more than two lanes of traffic to reach their destination.
8Under section 304.050 RSMo, when a school bus takes on or discharges passengers while stopped on the road or highway proper, how far must the bus be plainly visible to other drivers?
A.At least 100 feet in each direction
B.Visibility is not regulated as long as the hazard lights are on
C.At least 1,000 feet in each direction on every highway, regardless of shoulder or speed limit
D.300 feet each way, or 500 feet on a no-shoulder highway posted above 60 mph
Explanation: Section 304.050.5 RSMo says passengers may not be taken on or discharged on the road or highway proper unless the stopped bus is plainly visible for at least 500 feet in each direction on a highway with no shoulder and a speed limit greater than 60 mph, and at least 300 feet in each direction on other highways, and only for as long as necessary.
9Under Missouri law (RSMo § 304.050), what must a school bus driver do if followed by three or more vehicles after loading or unloading students?
A.Remain stopped, when safe, until those vehicles have passed
B.Accelerate quickly to the speed limit so traffic behind is not delayed
C.Keep the red lights flashing while driving so traffic stays behind the bus
D.Continue in the lane and let traffic pass wherever the road widens
Explanation: Section 304.050.7 RSMo says the driver of any school bus, after loading or unloading school children, shall remain stopped if the bus is followed by three or more vehicles, until those vehicles have been permitted to pass, if the conditions prevailing make it safe to do so.
10How many penalty points are assessed against a motorist's driving record in Missouri for a conviction of failing to stop for a school bus under RSMo § 304.050?
A.2 points
B.5 points
C.4 points
D.8 points
Explanation: Section 302.302.1(19) RSMo assigns 5 points for a conviction of failure to stop for a school bus that is receiving or discharging students, in violation of section 304.050.1. Points count toward suspension (8 points in 18 months) and revocation (12 in 12, 18 in 24, or 24 in 36 months).

About the MO CDL School Bus Exam

The Missouri CDL School Bus Endorsement Test is the 20-question written knowledge test required to drive a school bus in Missouri. Independent practice by OpenExamPrep covers Section 10 of the Missouri CDL Manual (danger zones, mirrors, loading and unloading, evacuation, railroad crossings, and student management) plus Missouri rules in RSMo §§ 302.272, 304.050, and 304.030 and the DESE operating rule 5 CSR 30-261.010. These practice questions are a study aid, not an official-format simulation.

Exam sponsor: Missouri Department of Revenue (DOR) and Missouri State Highway Patrol (MSHP). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

A 20-question multiple-choice knowledge test given in English only by the Missouri State Highway Patrol under § 302.720.2(1) RSMo, taken with the Passenger written test, followed by a skills test in a school bus of the same vehicle group (pre-trip inspection, basic vehicle control, on-road driving).

Time Limit

No time limit published; the Missouri CDL Manual says written CDL testing can take 1-2 hours depending on how many tests you take

Passing Score

80% on each CDL knowledge test

Exam / Certification Fees

$25 per written or driving test (§ 302.720 RSMo; waived for applicants 70+ renewing with an S endorsement); first CLP $44 total; most first-time CDLs about $83

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

RSMo §§ 302.272, 302.302, 304.050, 304.030 and 5 CSR 30-261.010 (official weight not published)

Missouri School Bus Laws and Driver Qualifications

Age 21 requirement, driving-record review, biennial skills retesting at 75 and older, 8-inch SCHOOL BUS lettering, the crossing control arm, 5 points for failing to stop for a school bus (§ 302.302 RSMo), English-only testing, and Missouri's DESE operating rule for district school buses.

Manual Section 10.1 (official weight not published)

Danger Zones and Use of Mirrors

The 10-foot danger zone around the bus, the 30-foot front danger zone, crossover mirrors, flat and convex exterior mirrors, inside rearview mirrors, and eliminating blind spots.

Manual Section 10.2 (official weight not published)

Loading and Unloading Procedures

Approaching stops, prewarning amber lights at least 500 feet before a designated stop (5 CSR 30-261.010), stopping with the bumper at least 10 feet from waiting students, red lights and stop arm, student crossing procedures, and counting students.

Manual Section 10.3 (official weight not published)

Emergency Exit and Evacuation

Mandatory evacuation conditions (fire, risk of fire, stalled on railroad tracks, unsafe position), evacuation steps, organizing students, student helpers, and post-evacuation roll call.

Manual Section 10.4 & RSMo § 304.030 (official weight not published)

Railroad-Highway Crossings for School Buses

Mandatory stop 15 to 50 feet from the nearest rail under RSMo § 304.030, silencing the bus, opening entrance door and driver window, double tracks, and emergency actions if stalled on tracks.

Manual Sections 10.5 to 10.7 (official weight not published)

Student Management and Special Safety

Handling behavior problems, never putting a student off except at school or the student's stop, antilock braking systems, strobe lights, high winds, backing, tail swing, and the post-trip walk-through.

Preparing for the MO CDL School Bus Exam

What You Need to Know

  • Passing score: 80% on each CDL knowledge test
  • Assessment: A 20-question multiple-choice knowledge test given in English only by the Missouri State Highway Patrol under § 302.720.2(1) RSMo, taken with the Passenger written test, followed by a skills test in a school bus of the same vehicle group (pre-trip inspection, basic vehicle control, on-road driving).
  • Time limit: No time limit published; the Missouri CDL Manual says written CDL testing can take 1-2 hours depending on how many tests you take
  • Exam / certification fees: $25 per written or driving test (§ 302.720 RSMo; waived for applicants 70+ renewing with an S endorsement); first CLP $44 total; most first-time CDLs about $83 Official sources

Using Our Practice Resources

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Frequently Asked Questions

How many questions are on the Missouri CDL School Bus endorsement test?

Section 14 of the Missouri CDL Manual lists the School Bus written exam at 20 multiple-choice questions, and you must score 80% (16 correct). You also take the Passenger (P) written test.

What is the minimum age to obtain a school bus endorsement in Missouri?

Under RSMo § 302.272, an applicant must be at least 21 years of age to qualify for a school bus endorsement in Missouri.

What applies to Missouri school bus drivers 75 and older?

Under RSMo § 302.272 (amended effective August 28, 2025), drivers 75 or older must pass the school bus skills test, excluding the pre-trip inspection, every two years, and § 302.735 provides a two-year license. The DOR waives the license and skills test fees at renewal but charges a $9 office processing fee.

How far before a stop must amber warning lights come on?

Missouri's DESE operating rule, 5 CSR 30-261.010, requires prewarning amber lights at least 500 feet before a designated stop (about 100 feet before a hill crest or blind curve). The Missouri CDL Manual gives a general minimum of 200 feet, or as state law requires.

What is the mandatory stop distance at railroad crossings for Missouri school buses?

Under RSMo § 304.030, school buses must come to a complete stop between 15 and 50 feet from the nearest rail of any railroad crossing before proceeding.