CDL HazMat Endorsement Exam Flashcards

Q: How many questions are on the CDL HazMat endorsement test?

The HazMat endorsement knowledge test contains 30 multiple-choice questions. You need to answer 24 correctly (80%) to pass. The federal content is standardized under 49 CFR, but the test is administered by your state DMV.

Q: What does it cost to get the HazMat endorsement?

The state DMV knowledge test fee typically ranges from $10-$25, plus an $86.50 TSA Security Threat Assessment fee for the required background check. ELDT HazMat theory training fees vary by provider, typically $50-$200.

Q: Do I need ELDT training before taking the HazMat test?

Yes. Since June 2022, FMCSA requires drivers obtaining their first HazMat endorsement (or upgrading after a lapse) to complete Entry-Level Driver Training (ELDT) HazMat theory from a provider on the FMCSA Training Provider Registry before sitting for the state knowledge test.

Q: Why do I need a TSA background check?

Federal law requires all CDL applicants seeking a HazMat endorsement to complete a TSA Security Threat Assessment. The check screens for disqualifying criminal, immigration, and intelligence-related factors. Processing typically takes 30-60 days.

Q: How long is the HazMat endorsement valid?

The HazMat endorsement must be renewed every 5 years (or when your CDL renews, whichever comes first), and the TSA background check must be redone at each renewal. Some states require renewal more frequently.

Question 1

Hazardous Materials Regulations (HMR)

Accepted Answer

The federal rules in 49 CFR, issued by the DOT, that govern commercial transport of hazardous materials by all modes. They define classes, packaging, marking, placarding, and shipping-paper requirements. The HazMat test is built almost entirely on the HMR.

Question 2

DOT vs. EPA roles in HazMat

Accepted Answer

The DOT (through PHMSA and FMCSA) regulates the transportation of hazardous materials on the road. The EPA regulates the disposal and handling of hazardous waste. Both touch HazMat, but the driver follows DOT transport rules.

Question 3

Shipper vs. Carrier vs. Driver responsibilities

Accepted Answer

The shipper classifies, packages, marks, labels, and prepares shipping papers, then certifies the shipment. The carrier transports it safely and placards the vehicle. The driver inspects the load, refuses unsafe packages, and handles the material en route.

Question 4

Hazardous Materials Table (HMT)

Accepted Answer

The master list in 49 CFR 172.101. For each proper shipping name it gives the hazard class, identification number, packing group, label codes, special provisions, and packaging requirements. Shippers use it to classify and describe materials.

Question 5

ELDT HazMat theory training

Accepted Answer

Since June 2022, drivers seeking a first HazMat endorsement (or restoring a lapsed one) must complete Entry-Level Driver Training theory from an FMCSA Training Provider Registry provider before taking the state knowledge test.

Question 6

Hazard Class 1 - Explosives

Accepted Answer

Materials that can explode, such as dynamite, ammunition, and fireworks. Class 1 has six divisions (1.1 most hazardous through 1.6 least sensitive). Division 1.1 explosives have a mass-explosion hazard.

Question 7

Hazard Class 2 - Gases

Accepted Answer

Compressed, liquefied, or dissolved gases. Three divisions: 2.1 flammable gas (propane), 2.2 non-flammable/non-toxic gas (oxygen, helium), and 2.3 toxic/poison gas (chlorine). Class 2.3 placards are required for any quantity.

Question 8

Hazard Class 3 - Flammable and Combustible Liquids

Accepted Answer

Liquids that give off ignitable vapors. A flammable liquid has a flash point at or below 140 degrees F (gasoline, diesel). A combustible liquid has a flash point above 140 degrees F and below 200 degrees F.

Question 9

Hazard Class 4 - Flammable Solids

Accepted Answer

Three divisions: 4.1 flammable solid, 4.2 spontaneously combustible, and 4.3 dangerous when wet. Division 4.3 materials release flammable gas when they contact water, so they must be kept dry.

Question 10

Hazard Class 5 - Oxidizers and Organic Peroxides

Accepted Answer

Division 5.1 oxidizers supply oxygen and intensify fires. Division 5.2 organic peroxides are thermally unstable and can self-decompose, catch fire, or explode if exposed to heat, friction, or contamination.

Question 11

Hazard Class 6 - Poisons and Infectious Substances

Accepted Answer

Division 6.1 covers toxic/poisonous materials; Division 6.2 covers infectious substances. Class 6 materials must never be loaded in the same vehicle as food intended for humans or animals.

Question 12

Hazard Classes 7, 8, and 9

Accepted Answer

Class 7 is radioactive material. Class 8 is corrosives, which destroy skin or corrode metal (battery acid, sodium hydroxide). Class 9 is miscellaneous dangerous goods that pose a hazard not covered by other classes (lithium batteries, dry ice).

Question 13

Poison Inhalation Hazard (PIH)

Accepted Answer

A material, often a toxic gas like chlorine or anhydrous ammonia, that is dangerous to breathe even in small amounts. PIH/TIH materials must be placarded regardless of quantity because the hazard is extreme.

Question 14

Packing Group (PG I, II, III)

Accepted Answer

The degree of danger a material presents within its class. PG I is great danger, PG II is medium danger, PG III is minor danger. The packing group affects packaging strength and handling requirements.

Question 15

Identification Number (UN/NA number)

Accepted Answer

A four-digit code that identifies the material (UN1203 is gasoline). 'UN' is internationally recognized; 'NA' applies in North America only. Responders use it to look the material up in the Emergency Response Guidebook.

Question 16

Purpose of placards

Accepted Answer

Diamond-shaped signs that warn the public and emergency responders of the hazard class inside the vehicle using color, symbol, and class number. Placards do not name the company or destination - they communicate danger.

Question 17

Placards required on how many sides

Accepted Answer

Placards must be displayed on all four sides of the vehicle - front, rear, and both sides - so the hazard is visible from any direction of approach. They must be readable, secured, and away from other markings.

Question 18

1,001-pound placarding threshold (Table 2)

Accepted Answer

For Table 2 materials, placards are required once the total weight of all hazardous materials on the vehicle reaches 1,001 pounds aggregate gross weight. Below that, non-bulk Table 2 loads generally do not need placards.

Question 19

Table 1 vs. Table 2 placarding

Accepted Answer

Table 1 materials (such as Division 1.1, 1.2, 1.3 explosives, 2.3 poison gas, and PIH materials) must be placarded for ANY quantity. Table 2 materials only need placards once the load reaches 1,001 pounds aggregate.

Question 20

DANGEROUS placard

Accepted Answer

Used for a mixed load of two or more Table 2 hazard categories totaling 1,001 pounds or more, when no single class needs its own placard. If 2,205 pounds or more of one category is loaded at one stop, that class's specific placard is used instead.

Question 21

Bulk packaging always needs placards

Accepted Answer

Bulk packages such as cargo tanks must be placarded for any quantity of a Table 2 material - the 1,001-pound rule applies only to non-bulk packages. A cargo tank of gasoline gets Flammable placards on all four sides regardless of weight.

Question 22

Marking vs. Label on a package

Accepted Answer

Markings are descriptive text on the package: proper shipping name, UN/NA number, and consignee or shipper address. Labels are diamond-shaped symbols showing the hazard class. Markings tell what it is; labels show the hazard.

Question 23

Bulk vs. non-bulk packaging

Accepted Answer

For liquids, bulk packaging has a maximum capacity greater than 119 gallons; non-bulk is 119 gallons or less. The distinction drives placarding, marking, and which inspection rules apply.

Question 24

Package orientation arrows

Accepted Answer

Two upward-pointing arrows marked on combination packaging containing liquid mean the package must be kept upright. Loading it on its side risks leaks from closures and bungs.

Question 25

Limited Quantity marking

Accepted Answer

Indicates a small amount of hazardous material in sturdy combination packaging. Because the reduced quantity lowers the risk, Limited Quantity shipments are exempt from some requirements such as placarding and full shipping papers.

Question 26

Shipping papers - the basic description

Accepted Answer

Hazmat shipping papers must list the basic description in order: identification number, proper shipping name, hazard class or division, and packing group - for example 'UN1203, Gasoline, 3, PG II'.

Question 27

Identifying hazmat on a mixed shipping paper

Accepted Answer

When a shipping paper lists hazardous and non-hazardous items together, the hazmat entries must stand out: listed first, printed in a contrasting color, highlighted, or marked with an 'X' in the HM column.

Question 28

Where shipping papers must be kept while driving

Accepted Answer

While driving, papers must be within the driver's immediate reach, readily recognizable, and either in a pouch on the driver's door or on the seat. They cannot be locked in the glove box or buried with the cargo.

Question 29

Where shipping papers go when the driver leaves the vehicle

Accepted Answer

If the driver steps away, the papers must be left in the driver's door pouch or on the driver's seat - placed so emergency responders can find them quickly from outside the cab.

Question 30

Shipper's certification

Accepted Answer

A signed statement on the shipping paper in which the shipper certifies the material is properly classified, described, packaged, marked, labeled, and in proper condition for transport. The shipper - not the driver - signs it.

Question 31

Reportable Quantity (RQ)

Accepted Answer

The amount of a hazardous substance that, if released, must be reported to the National Response Center. 'RQ' next to an entry on shipping papers flags the material as one with federal spill-reporting requirements.

Question 32

Shipping paper retention period

Accepted Answer

Carriers must keep a copy of each hazmat shipping paper for one year after the initial carrier accepts the shipment. Hazardous waste manifests must be retained for at least three years.

Question 33

Emergency Response Guidebook (ERG)

Accepted Answer

A reference responders use to quickly identify a material's hazards by UN number or name and find initial protective actions. The blue section is the name index, yellow the ID-number index, orange the action guides, and green the isolation distances.

Question 34

First priority in any hazmat emergency

Accepted Answer

Personal and public safety always comes first. Stop in a safe place, identify the material from shipping papers and the ERG, secure the scene, keep bystanders away, then notify emergency services - assess before you act.

Question 35

Response to a hazmat vehicle fire

Accepted Answer

A portable extinguisher cannot control a hazmat fire. Warn others, move to a safe distance, and call emergency services. Do not drive a burning vehicle or try to unhitch a burning trailer.

Question 36

When to notify the National Response Center (NRC)

Accepted Answer

The NRC must be notified for incidents involving a death, a hospitalized injury, major transportation disruption, fire/breakage/spillage of radioactive or infectious material, or release of a Reportable Quantity of a hazardous substance.

Question 37

Handling a small leak en route

Accepted Answer

Pull over to a safe place, identify the material using shipping papers and the ERG, and stop the leak only if it can be done safely (such as tightening a valve). If not, secure the area and call for help - never wash an unknown chemical with water.

Question 38

Tire fire on a hazmat vehicle

Accepted Answer

Do not spray a burning tire with a small extinguisher - it may explode. Stop in a safe, open area, evacuate, warn others, and call emergency services. Tire heat can ignite the cargo.

Question 39

Information to give emergency responders

Accepted Answer

Hand responders the shipping papers - the single most useful document. They use the proper shipping name, hazard class, and UN number to identify the material and choose the correct response.

Question 40

Securing and bracing the load

Accepted Answer

The core loading rule is to prevent movement. Hazmat packages must be blocked and braced so they cannot shift, tip, or fall during starts, stops, and turns. Drums are loaded upright and braced tight.

Question 41

Refusing damaged or leaking packages

Accepted Answer

A driver must not accept a hazmat package that is leaking or damaged. Providing cargo in proper condition is the shipper's responsibility - the driver should refuse the shipment, not attempt a repair.

Question 42

Segregation (separation) rules

Accepted Answer

Certain hazard classes cannot be loaded, transported, or stored together because they can react dangerously if they mix. The Segregation and Separation Table in the HMR specifies which combinations are prohibited.

Question 43

Cyanides and acids must be separated

Accepted Answer

Cyanides (Division 6.1) loaded with acids (Class 8) can react to produce deadly hydrogen cyanide gas. This is a strict segregation rule - the two must never travel together.

Question 44

No smoking and ignition-source rules

Accepted Answer

Never smoke within 25 feet of a vehicle carrying explosives (Class 1), flammables (Class 3), or oxidizers (Class 5). Use only non-sparking tools around explosives, and never run a cargo heater with Class 1, Class 3, or flammable gas loads.

Question 45

Pre-loading and pre-trip inspection of a hazmat vehicle

Accepted Answer

Before loading, inspect the cargo space for holes, cracks, or damage. On a pre-trip, focus on tires, brakes, and any signs of leaks. Tankers require tank-and-fitting checks before loading and after unloading.

Question 46

Railroad crossing stops

Accepted Answer

A placarded hazmat vehicle must stop 15 to 50 feet before the nearest rail and check for trains. Stops are not required when a police officer or flagman directs traffic, a green traffic signal controls the crossing, or it is marked exempt or abandoned.

Question 47

Route planning and tunnel/route restrictions

Accepted Answer

Hazmat drivers must use designated hazmat routes where they exist, even if longer, and obey local bans on tunnels and bridges. Routes for explosives are chosen to avoid populated areas and critical infrastructure.

Question 48

Parking and attendance rules

Accepted Answer

A placarded vehicle must be attended unless parked at a carrier facility, the consignee's site, or a safe haven. Keep it at least 5 feet from the traveled roadway, and not within 300 feet of an open fire, a bridge, or a tunnel.

Question 49

Safe haven

Accepted Answer

A government-approved, supervised area where a driver may leave a vehicle carrying explosives unattended. It is one of the few situations where a placarded explosives load does not require the driver's constant attendance.

Question 50

TSA Security Threat Assessment and security plan

Accepted Answer

Every driver seeking a HazMat endorsement must pass a TSA background check screening criminal, immigration, and terrorism databases. Carriers transporting placarded amounts of certain materials must also keep a written security plan covering personnel vetting, access control, and en-route security.

Free CDL HazMat Endorsement Exam Flashcards

Filter by Topic

Jump to Card

About These CDL HazMat Endorsement Flashcards

Topics Covered

Frequently Asked Questions

CDL HAZMAT Endorsement

Explore More CDL

CDL Commercial Driver's License

CDL Doubles and Triples Endorsement

CDL Tanker Endorsement

CDL Passenger Endorsement

CDL Air Brakes Knowledge Test

CDL Combination Vehicles Knowledge Test

More From This Family