Free Hawaii CDL practice test online
Take a free Hawaii CDL practice exam online with clear explanations—no sign-up. Coverage includes general knowledge, vehicle systems, combination vehicles, cargo, and endorsements. Then verify current requirements with Hawaii Department of Transportation.
Hawaii Department of Transportation gives the general knowledge test as 50 questions, and federal law sets the bar at 80% correct on every knowledge test. You must also hold a commercial learner’s permit for 14 days before the skills test.
New to the knowledge test? CDL endorsements explained · One-week study plan
Requirements before you test
Hawaii CDL test requirements
Commercial licensing is largely federal. Any figure above credited to a 49 CFR section applies in every state — see 49 CFR 383.135(a)(1) and 49 CFR 383.25(e). A figure credited to Hawaii Department of Transportation is Hawaii’s own, and may be stricter than the federal floor. Test length, fees, and scheduling are set by Hawaii Department of Transportation (official source).
Entry-Level Driver Training comes first
Since February 7, 2022, a new Class A or Class B CDL, a class upgrade, or a first passenger, school bus, or hazardous materials endorsement requires training from a provider on the FMCSA Training Provider Registry (49 CFR 380.600). Practice questions are study material and do not satisfy that requirement.
FMCSA Training Provider RegistryYou need a Hawaii licence first
A commercial learner’s permit only counts if you already hold an ordinary licence from the same state (49 CFR 383.25(a)(2)). The Hawaii non-commercial knowledge test runs 30 questions and needs 24 correct, with permits issued from age 15 years, 6 months.
Hawaii permit practice testWhat you will practice
Build coverage topic by topic.
Each question carries a topic, difficulty, explanation, and source section so your review has context.
Sample questions
5 Hawaii CDL practice questions
Try these Hawaii sample questions now — each shows the correct answer with a plain-language explanation and a source section. The full 600-question bank is in the practice run.
1. To check governor cut-out, run the engine at a fast idle until:
- ASpring brakes apply
- BThe safety valve opens at 80 psi
- CPressure falls to 60 psi
- Gauges stop rising at about the manufacturer’s cut-out (around 125 psi)
Answer: Gauges stop rising at about the manufacturer’s cut-out (around 125 psi). Then fan the brakes with the engine idling and confirm cut-in near the specified pressure (often around 100 psi).
Source: Commercial Driver License Manual — Air brakes — final air brake check
2. Allow more following distance with doubles and triples because they:
- Cannot be turned or stopped suddenly and are longer
- BHave no mirrors
- CAre exempt from space rules
- DStop shorter than cars
Answer: Cannot be turned or stopped suddenly and are longer. Make sure traffic gaps are large enough before entering or crossing an intersection.
Source: Commercial Driver License Manual — Doubles and triples — space management
3. A systematic pre-trip inspection is important because it:
- AReplaces hours-of-service logs
- Finds problems that could cause a crash or breakdown before you drive
- CIs optional under 10,000 pounds always
- DOnly checks radio presets
Answer: Finds problems that could cause a crash or breakdown before you drive. Use a consistent method so you do not skip tires, brakes, lights, coupling, or emergency equipment.
Source: Commercial Driver License Manual — Vehicle inspection — purpose
4. Why must water be drained from air tanks?
- AIt increases fuel consumption
- It can freeze and cause brake failure in cold weather
- CIt raises the governor cut-out point
- DIt shortens the tread life of tires
Answer: It can freeze and cause brake failure in cold weather. Compressing air produces water and oil that collect in the tanks. If it freezes, the brake system can fail.
Source: Commercial Driver License Manual — Air brakes — tank draining
5. Smoking is prohibited within how many feet of a vehicle carrying explosives or flammable materials?
- 25 feet
- B50 feet
- C75 feet
- D10 feet
Answer: 25 feet. The 25-foot rule also covers an empty tank vehicle that was required to be placarded for flammable liquids or gases.
Source: Commercial Driver License Manual — Hazardous materials — smoking (49 CFR 397.13)
CDL knowledge areas
Classes and endorsements, organized.
Each area below scopes the reviewed question bank to one knowledge test. The material is federal, so it applies in Hawaii just like everywhere else — the endorsement guide explains how the codes fit together.
The foundation for commercial driving: inspections, space, speed, communication, hazards, and safe operation.
- Pre-trip inspection
- Space and speed management
- Railroad crossings
- Emergency procedures
Understand air-brake components, inspections, warning devices, stopping distance, and controlled braking.
- Dual air systems
- Low-air warnings
- Brake lag and fade
- Applied-leak and static checks
Prepare for safe coupling, inspection, turning, backing, and handling of tractor-trailer combinations.
- Fifth-wheel inspection
- Coupling and uncoupling
- Off-tracking
- Trailer skid prevention
Study hazard communication, shipping papers, placards, loading rules, parking, and emergency response responsibilities.
- Hazard classes
- Placards and labels
- Shipping papers
- Loading and segregation
Learn how liquid surge, outage, bulkheads, and high centers of gravity change vehicle handling.
- Liquid surge
- Outage requirements
- Smooth braking
- Rollover prevention
Practice converter-dolly inspection, coupling order, rearward amplification, and stability principles.
- Coupling sequence
- Converter dollies
- Rearward amplification
- Space management
Prepare to inspect, load, and operate buses while keeping passengers, aisles, and exits safe.
- Vehicle inspection
- Passenger loading
- Emergency exits
- Prohibited practices
Review student loading, danger zones, mirrors, emergency procedures, and special railroad-crossing duties.
- Danger zones
- Student loading
- Mirror use
- Railroad crossings
More west practice
Nearby CDL practice tests
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Common questions
What this practice can—and cannot—tell you.