Arizona CDL Knowledge Test Overview

If you're aiming to start a career as a commercial driver in Arizona, passing the CDL knowledge test is your first major step. The Arizona CDL knowledge exams are designed to assess your understanding of essential safety protocols, operational rules, and regulations that apply to commercial motor vehicles (CMVs). This guide explains what to expect from these tests and how best to prepare.

Types of CDL Knowledge Tests

Depending on the class of license and endorsements you need, you may be required to take one or several written knowledge tests. These include:

General Knowledge Test

This is mandatory for all CDL applicants. It covers:

• CMV operating procedures
• Vehicle inspection requirements
• Cargo handling and transportation laws
• Hazardous conditions and accident protocols

Endorsement-Specific Tests

Endorsements allow drivers to operate specialized vehicles or transport particular cargo. These may include:

• Passenger Transport (P)
• School Bus (S)
• Hazardous Materials (H)
• Tanker Vehicles (N)
• Double/Triple Trailers (T)

Each endorsement requires a separate written test.

Air Brakes Test

If the vehicle you plan to drive is equipped with air brakes, you must pass this specific test to avoid a restriction on your CDL.

Test Format and Scoring

The Arizona CDL knowledge tests are multiple-choice, computer-based exams administered at MVD offices. Most tests consist of 20 to 50 questions depending on the exam type, and a score of 80% or higher is required to pass.

You can review the test fees and costs in this detailed overview.

Eligibility and Requirements

To take the CDL knowledge test in Arizona, you must:

• Be at least 18 years old for intrastate driving; 21 for interstate or hazardous materials
• Hold a valid Arizona driver’s license
• Provide proof of lawful presence in the U.S.
• Meet all medical requirements

For new Arizona residents with an out-of-state CDL, refer to the testing guide for new residents.

How to Prepare for the CDL Knowledge Test

Study the CDL Manual

Your primary resource should be the Arizona CDL Manual, available for free from the Arizona Department of Transportation (ADOT) website. It contains everything tested in the exams, including detailed descriptions and sample questions.

Use a Study Plan

Create a daily or weekly schedule based on sections of the CDL manual. This structured approach ensures you cover every topic without cramming.

If you're also studying for the basic Arizona written test, this written test overview may help reinforce foundational traffic law knowledge.

Know the Vision and Medical Requirements

The CDL exam process also includes vision and medical assessments. Learn more about the vision testing standards here.

Testing Accommodations

Applicants with disabilities or language barriers may qualify for special accommodations. For details on interpreters, translated exams, or other support options, check the Arizona DMV accommodations page.

After You Pass

Once you’ve successfully passed the knowledge tests, you’ll be issued a Commercial Learner’s Permit (CLP). With your CLP in hand, you can begin supervised driving practice and prepare for the CDL skills (road) test.

Your CLP is valid for 180 days. Within this period, schedule your road test appointment and continue practicing under the supervision of a licensed CDL holder.

By understanding the structure, content, and expectations of the Arizona CDL knowledge tests, you can walk into the exam room prepared and confident. Pair your study materials with practice tests and stay informed about requirements to ensure a smooth path to earning your commercial driver’s license.