Missouri's CDL manual and DMV CDL Practice Tests

for all endorsements

Missouri's CDL Manual

Commercial Driver Handbook

CDL Classes in Missouri Commercial driver’s licenses in Missouri can fall under one of three classes:

  • Class A CDL
  • Class B CDL
  • Class C CDL

CDL Endorsements in Missouri What are endorsements? To drive specific vehicles or carry specific loads, you need to have the right endorsement on your commercial license. This will show that you received special training for it. Now, there are 6 endorsements available in Missouri. These are:

  • T (Double/Triple Trailer) — if you operate combination vehicles towing two or more units.
  • N (Tank) — if you’re driving a vehicle with tanks permanently or temporarily attached to it. It usually transports liquid or gaseous materials.
  • S (School Bus) — if you’re operating a school bus.
  • P (Passenger) — if you’re transporting passengers using your commercial vehicle.
  • H (Hazmat) — if you’re moving hazardous materials in quantities requiring placarding.
  • X (Combination H & N) — if you’re transporting hazardous materials in a tank vehicle.

You can get three endorsements on a commercial permit — N, S, and P. As for the rest (T, H, and X), you can only get it once you have a CDL. CDL Requirements in Missouri Before we look at the steps to getting your CDL, let’s see if you qualify:

  • You meet the age requirement(18 if you’re driving within Missouri,21 if you’re crossing state lines)
  • You’re a U.S. citizen or a permanent resident
  • You are a Missouri resident
  • You have a Missouri-issued driver’s license
  • Your driving privileges are active
  • You’re compliant with the Federal Motor Carrier Safety Regulation’s medical requirements.
  • You are proficient in English (enough to speak and read it)

How many times can you get the CDL permit test in Missouri? You can take the CDL permit test as many times as you need. However, you can only have 1 attempt per day. And, you will have to pay the test fee again. This is why it’s best to arrive prepared. Also, remember that you must get 80% or higher on each exam (assuming you’re taking more than one due to endorsements) to pass.

DMV CDL Practice Tests

General Knowledge

The general knowledge test is the first of several tests that you will have to complete in order to get your CDL. The questions cover general information about commercial vehicles, driving, and vehicle inspections. The test has a total of 50 questions, and requires at least 40 correct answers to pass.

Air Brakes

You must have an Air brake endorsement on your driver's license to drive a vehicle equipped with an air brake system. This test will test your knowledge of the function, parts, and braking distance of air brakes. The test will consist of 25 questions, and at least 20 correct answers are needed to pass.


The combination endorsement allows you to drive a vehicle with a power unit and one trailer. This test will cover the "ins and outs" of operating articulated vehicles. The exam consists of 25 questions, and requires at least 20 correct to pass.

Hazardous Material

The Hazardous Material endorsement allows the driver to operate a vehicle containing items such as poisons, explosives, flammables, etc. You will also have to pass the TSA Hazardous Material Threat Assessment to get this endorsement. There are 30 questions, 24 correct required to pass.


The Tanker endorsement allows the driver to operate a vehicle weighing more than 26,000 pounds designed to transport any liquid or gaseous material within a tank that is permanently or temporarily attached to the vehicle. There are 20 questions, 16 correct required to pass.

Doubles / Triples

The Doubles/Triples endorsement is required for drivers to pull 2 trailers (doubles) or 3 trailers (triples) connected to a single power unit. There are 20 questions on this test, and 16 correct answers are required to pass.


Bus drivers must have a commercial driver's license with a passenger endorsement in order to operate a vehicle which seats 16 or more, including the driver. There are 20 questions on this test, and 16 correct answers are required to pass.

School Bus

School Bus Endorsement is required for any driver who operates a school bus. After the permit tests the training can be only completed by a local school district. There are 20 questions on this test, and 16 correct answers are required to pass.

Pre Trip Inspection

The Pre-Trip exam is an oral exam where you are expected to check the vehicle parts to insure it is safe for road use. The amount of parts you need to check increase with the size of the vehicle, and by type of vehicle.