Hazardous Materials (Hazmat) Practice Test
The H endorsement is required to transport any quantity of hazardous materials that requires placards under 49 CFR 172.504. The test covers the hazardous materials regulations, classification system, shipping papers, package marking and labeling, vehicle placarding, the segregation table, loading and unloading rules, attendance requirements, parking and routing restrictions, the Emergency Response Guidebook, and incident reporting. In addition to passing the knowledge test, applicants must complete a TSA Security Threat Assessment, including fingerprinting, every five years.
How to use this practice bank
Read each question carefully before checking the answer. Most CDL questions are not designed to trick you, but they do test whether you know the specific rule — not just what feels safe. After reading the explanation, try to restate the rule in your own words; if you can, you've internalized it. If you can't, look up the corresponding chapter of your state's CDL handbook before moving on.
Pass scores vary slightly by state, but most jurisdictions require at least 80% correct on each knowledge exam. With 60 questions in this bank you have substantially more practice material than any single sitting of the real exam, which typically contains 20 to 50 questions per endorsement.
All 60 questions in this bank
- #1Hazardous materials are products that:
- #2The shipping paper for hazardous materials must contain:
- #3Placards on a vehicle indicate:
- #4The Emergency Response Guidebook (ERG):
- #5Most hazardous materials cannot be loaded together with:
- #6When loading or unloading hazmat, you must:
- #7You must stop before crossing railroad tracks within how many feet when transporting hazardous materials?
- #8Routing of placardable hazmat shipments must avoid:
- #9A driver who is transporting Division 1.1, 1.2, or 1.3 explosives must:
- #10The proper place for shipping papers when driving hazmat is:
- #11Containers of hazardous materials in transport must be marked with:
- #12When carrying Class 1 (Division 1.1 or 1.2) explosives, the driver must have:
- #13You should never use flares, signal flames, or other flame-producing emergency devices near vehicles loaded with:
- #14The shipper of hazardous materials is responsible for:
- #15Vehicles carrying any amount of certain hazardous materials must always be placarded — these are listed in:
- #16When two or more hazardous materials require different placards on the same vehicle, you must:
- #17A radioactive 'Yellow III' label means the package:
- #18You must report a hazardous-materials incident immediately if:
- #19Bulk packaging of hazardous materials requires:
- #20Drivers must keep their hazmat training records for:
- #21When parking a vehicle carrying explosives, the driver must:
- #22Tank vehicles transporting hazardous materials must comply with the same loading rules as:
- #23Compatible hazardous materials may be loaded together only if:
- #24A 'cargo tank' is:
- #25Hazmat drivers must report incidents that involve continuing danger to life from:
- #26When a hazmat incident occurs, the driver should:
- #27The 'X' in front of a hazard class column on the shipping paper means:
- #28Subsidiary hazard classes are listed:
- #29A driver must check tires on a placarded vehicle:
- #30Vehicles carrying Class 7 (radioactive) materials must:
- #31When fueling a hazmat-carrying vehicle, the driver must:
- #32A bulk shipment of hazardous materials normally requires:
- #33The 'orange panel' on a tank truck:
- #34A driver carrying placardable hazmat must:
- #35Drivers carrying hazardous materials are prohibited from smoking near the vehicle when within how many feet?
- #36A 'safe haven' for parking explosives is:
- #37A 'reportable quantity' (RQ) on a shipping paper means:
- #38When unloading flammable liquids from a cargo tank, the driver must:
- #39The Hazardous Materials Regulations require:
- #40Loading and unloading of Class 1 (explosives) at a private location:
- #41You should never park a vehicle carrying hazardous materials within 5 feet of:
- #42When a driver leaves a placarded vehicle unattended, the driver must:
- #43A vehicle is placarded when:
- #44Liquid discharge valves on a cargo tank must be closed:
- #45Hazardous materials labels must:
- #46A 'subsidiary placard' is used when:
- #47A driver of a hazmat vehicle must not:
- #48The shipping paper for a hazmat shipment must be:
- #49Hazardous materials drivers must communicate the danger of the cargo by:
- #50The four-digit identification number for a material is found:
- #51The most important thing to know about hazardous materials is:
- #52When transporting Division 2.3 poison gases, you must:
- #53A 'placarded' load means the vehicle:
- #54You must not transport food and hazmat together unless:
- #55When refueling a placarded hazmat vehicle, the driver must:
- #56The driver of a placarded vehicle should plan the route to:
- #57When unloading explosives, you must:
- #58A vehicle's emergency response information must include:
- #59Drivers carrying placarded hazmat must possess and have available in the cab:
- #60When carrying hazmat through a tunnel, the driver should:
About the Hazardous Materials (Hazmat) exam
The Hazardous Materials (Hazmat) knowledge test is a multiple-choice exam administered at every state CDL testing site. The questions on this page are seeded from the AAMVA Commercial Driver License Manual — the same source that state agencies use when writing their official questions — and from the corresponding sections of Title 49 of the Code of Federal Regulations. Real test questions are randomly selected from a much larger pool, so practice covers the rules and concepts rather than the wording of any one item.
The most efficient way to study is to work through this bank twice. The first pass identifies the rules you do not yet know; the second pass confirms recall. Drivers who have studied for years rarely miss a question, but newcomers should expect to need a week or more of repeated reading and quizzing before sitting the real exam. Combine this site with your state's printed CDL handbook for the most complete preparation.