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CDL Hazardous Materials Endorsement (HME) practice questions

200 free questions with answers and explanations.

Practice test
  1. 1.A driver is transporting a bulk shipment of gasoline (UN1203, Class 3, PG II). What is the minimum distance the driver must park from the traveled portion of a public roadway if the vehicle is unattended and not at a fueling stop or rest area?Hazardous Materials Regulations
  2. 2.A driver is transporting a shipment of Division 5.1 (Oxidizer) and Division 3 (Flammable Liquid) materials. Which of the following statements about segregation is TRUE?Hazardous Materials Regulations
  3. 3.A driver is transporting a shipment of hazardous waste. Which of the following documents is specifically required for hazardous waste shipments in addition to the standard shipping paper?Hazardous Materials Regulations
  4. 4.A driver is transporting a bulk quantity of UN1993, Flammable liquids, N.O.S., Class 3, PG II. During transit, the driver notices a minor leak from a valve on the cargo tank, releasing a small amount of liquid. The leak is not immediately dangerous and can be contained. What is the driver's FIRST priority after safely stopping the vehicle?Hazardous Materials Regulations
  5. 5.A driver is transporting a shipment of UN1760, Corrosive liquid, N.O.S., Class 8, PG II. What is the PRIMARY hazard associated with Class 8 materials?Hazardous Materials Regulations
  6. 6.A driver is carrying a shipment of Division 2.3 (Poisonous Gas) material. Which of the following statements regarding the placement of shipping papers is correct?Hazardous Materials Regulations
  7. 7.A driver discovers that 150 gallons of a corrosive liquid (UN1760, Class 8, PG II) has leaked from its packaging inside a closed trailer. There is no immediate danger to life or property beyond the trailer itself. What is the driver's immediate priority according to hazardous materials regulations?Hazardous Materials Regulations
  8. 8.A driver is transporting a bulk quantity of UN1203, Gasoline, Class 3 (Flammable Liquid), PG II. After an accident, the driver discovers a small leak from the cargo tank. The leak rate is approximately 1 gallon per minute, and the material is flowing into a ditch that leads to a storm drain. What is the driver's PRIMARY responsibility in this situation?Hazardous Materials Regulations
  9. 9.A carrier is transporting several hazardous materials. Which of the following materials is ALWAYS forbidden from being transported by highway in a commercial motor vehicle?Hazardous Materials Regulations
  10. 10.A driver is transporting a load of hazardous materials that includes a Division 2.3 (Poisonous Gas) material. Which of the following statements about the driver's responsibilities for this material is true?Hazardous Materials Regulations
  11. 11.When a driver encounters a hazardous materials incident, the initial assessment of the situation should primarily focus on identifying the material, assessing the immediate hazards, and determining the appropriate protective actions. Which of the following is the MOST reliable source of information for quickly identifying the specific hazardous material and its immediate dangers at an incident scene?Emergencies and Accidents
  12. 12.A truck carrying hazardous materials is involved in an accident, resulting in a fire. The material is identified as UN1075, Liquefied Petroleum Gas. What is the PRIMARY concern for firefighters approaching this scene, according to the Emergency Response Guidebook (ERG)?Emergencies and Accidents
  13. 13.A driver is preparing to transport a shipment of hazardous materials. According to the Hazardous Materials Regulations (HMR), what is the primary intent behind the regulations concerning hazardous materials transportation?Hazardous Materials Regulations
  14. 14.During a hazmat incident involving a spill of a corrosive liquid, the driver has initiated emergency procedures and is awaiting responders. What type of personal protective equipment (PPE) is generally considered the MINIMUM requirement for approaching the immediate vicinity to confirm the material, assuming no specialized information is yet available?Emergencies and Accidents
  15. 15.A driver is performing a pre-trip inspection on a placarded vehicle carrying hazardous materials. Which of the following is a specific item the driver must check related to the hazardous materials cargo?Hazardous Materials Regulations
  16. 16.A driver is transporting a cargo tank of UN1993, Flammable Liquids, N.O.S. (Class 3, PG II). During a pre-trip inspection, the driver discovers a small leak from a valve on the cargo tank. What is the driver's immediate responsibility?Hazardous Materials Regulations
  17. 17.A driver is transporting Division 6.1 (Poisonous Materials) and Division 8 (Corrosive Materials) on the same vehicle. Which of the following segregation requirements must the driver primarily observe?Hazardous Materials Regulations
  18. 18.A driver is involved in an accident with a tank truck carrying UN1203, Gasoline. The tank is ruptured, and a large pool of gasoline is forming on the ground, but it has not yet ignited. The driver has safely evacuated, called 911, and is awaiting responders. What is the MOST immediate and significant environmental hazard posed by this unignited spill?Emergencies and Accidents
  19. 19.A driver is transporting 900 pounds of Division 4.1 (Flammable Solid) and 200 pounds of Division 5.1 (Oxidizer) in non-bulk packages. Which of the following statements about placarding is TRUE?Hazardous Materials Regulations
  20. 20.A driver is transporting Class 6.1 Poisonous/Toxic materials. During a routine stop, they notice a distinct, unfamiliar odor emanating from the trailer, and there are no visible leaks. What is the MOST appropriate initial action the driver should take?Emergencies and Accidents
  21. 21.A driver notices a package labeled with a 'CORROSIVE' hazard label (Class 8). What primary hazard does this material pose?Hazardous Materials Regulations
  22. 22.A driver is transporting UN1017, Chlorine, Class 2.3 (Poison Gas), in a cargo tank. Which of the following is an additional driver requirement SPECIFICALLY for transporting Class 2.3 materials?Hazardous Materials Regulations
  23. 23.A driver is transporting a package marked 'RQ, Corrosive Liquid, Acidic, Inorganic, N.O.S., 8, UN3264, PG II'. What does 'RQ' indicate on this shipping paper entry?Hazardous Materials Regulations
  24. 24.A driver is transporting a shipment of hazardous materials. When performing a pre-trip inspection, which of the following is a specific requirement for a placarded vehicle carrying hazardous materials, in addition to standard vehicle checks?Hazardous Materials Regulations
  25. 25.A driver is transporting Class 3 Flammable Liquids and discovers a small leak from a container during a pre-trip inspection. The leak is dripping slowly, but the liquid is not spreading beyond the immediate area of the container. What is the immediate and most appropriate action the driver should take?Emergencies and Accidents
  26. 26.A driver is transporting a shipment of Division 2.2 (Non-Flammable, Non-Poisonous Gas) in cylinders. The total gross weight of this material is 1,500 pounds. What type of placard is REQUIRED for this shipment?Hazardous Materials Regulations
  27. 27.A driver is transporting Division 6.2 Infectious Substances (e.g., medical waste, UN3291). The vehicle is involved in a minor accident, and a small, contained spill of the infectious material occurs within a secondary containment liner inside the cargo area. What is the most critical immediate action for the driver?Emergencies and Accidents
  28. 28.A driver is transporting a bulk quantity of UN1075, Liquefied Petroleum Gas (LPG), a Class 2.1 (Flammable Gas). When must the driver attend the cargo tank during loading or unloading?Hazardous Materials Regulations
  29. 29.A driver is involved in an accident where a large quantity of a Division 4.2 Spontaneously Combustible material (e.g., white phosphorus, UN1381) has spilled onto the roadway. There is no fire yet, but the material is exposed to air. What is the most critical immediate action for the driver after ensuring personal safety and calling 911?Emergencies and Accidents
  30. 30.A driver is transporting 1,500 pounds of UN1830, Sulfuric acid (Class 8, PG II) in non-bulk packages. What type of placard is required on the vehicle?Hazardous Materials Regulations
  31. 31.A driver encounters an accident scene where a truck carrying Division 2.1 Flammable Gas (e.g., propane, UN1075) has overturned, and a large, unignited vapor cloud is rapidly expanding. The driver has already called 911. What is the most appropriate immediate protective action for the driver to take?Emergencies and Accidents
  32. 32.A driver is transporting 200 gallons of gasoline (UN1203, Class 3, PG II) and 100 pounds of ammonium nitrate fertilizer (UN1942, Class 5.1, PG III). Which of the following segregation rules applies to this mixed load?Hazardous Materials Regulations
  33. 33.A driver is transporting a shipment that includes 500 pounds of Division 4.1 (Flammable Solids) and 600 pounds of Division 5.1 (Oxidizing Substances). Both are listed in Placarding Table 2. What placarding actions must the driver take?Hazardous Materials Regulations
  34. 34.A driver is preparing to transport a cylinder containing UN1072, Oxygen, Compressed (Class 2.2). The cylinder has a marked service pressure of 2000 psi. What is the maximum allowable filling pressure for this cylinder at 70°F (21°C), assuming it is a non-liquefied compressed gas and no special authorization applies?Hazardous Materials Regulations
  35. 35.A driver is transporting a shipment of Class 7 (Radioactive) materials that are designated as Highway Route Controlled Quantity (HRCQ). Which of the following is a specific requirement for the driver regarding this type of shipment?Hazardous Materials Regulations
  36. 36.A driver is transporting a shipment of Class 1.1 explosives. Which of the following statements about safe parking rules is correct?Hazardous Materials Regulations
  37. 37.A driver is preparing to transport a shipment of UN1760, Corrosive liquid, N.O.S., Class 8, PG II. What is the maximum number of hazardous materials that can be listed on a single shipping paper?Hazardous Materials Regulations
  38. 38.A driver is transporting Class 8 Corrosive materials (e.g., sulfuric acid, UN1830) in drums. During transit, one of the drums develops a small puncture, and a slow drip of corrosive liquid is observed on the trailer floor. The driver has safely stopped the vehicle. What is the most appropriate next action?Emergencies and Accidents
  39. 39.A driver is transporting Class 4.3 Dangerous When Wet materials (e.g., Sodium). An accident occurs during heavy rain, and the material is exposed to water. What is the PRIMARY hazard that emergency responders must be prepared for in this scenario, beyond the initial material properties?Emergencies and Accidents
  40. 40.A driver is transporting 2,500 pounds of UN1075, Liquefied Petroleum Gas (LPG), which is a Division 2.1 (Flammable Gas). The LPG is contained in multiple non-bulk cylinders. Which of the following statements regarding the placarding of this vehicle is correct?Hazardous Materials Regulations
  41. 41.A driver discovers a small fire in the cargo area of a trailer containing boxes placarded with 'ORM-D' (Other Regulated Materials - Domestic). The fire is confined to one box and appears to be igniting the packaging, not the product itself. What is the MOST appropriate initial action for the driver if it is safe to do so?Emergencies and Accidents
  42. 42.A driver is transporting a shipment of Class 7 (Radioactive) materials that are in Type B packaging, with a total Transport Index of 15. Which of the following statements about routing is correct?Hazardous Materials Regulations
  43. 43.A driver is transporting Class 3 Flammable Liquids. During a routine stop, the driver notices a strong odor of gasoline emanating from the cargo area, but no visible spill or leak is observed. The surrounding area is well-ventilated. What is the most appropriate immediate action?Emergencies and Accidents
  44. 44.A driver is transporting a shipment of Class 7 (Radioactive) materials that are designated as Highway Route Controlled Quantity (HRCQ). Which of the following is a specific requirement for the route this driver must follow?Hazardous Materials Regulations
  45. 45.A driver is transporting a shipment of Class 2.2 Non-Flammable, Non-Poisonous Gas (e.g., compressed air, UN1002) in cylinders. During an inspection, the driver notices a small leak from one of the cylinder valves, creating an audible hiss but no visible cloud. What is the most appropriate immediate action?Emergencies and Accidents
  46. 46.A driver is transporting a bulk quantity of UN1203, Gasoline, Class 3 (Flammable Liquid), in a cargo tank. During a pre-trip inspection, the driver notices a small leak at a valve on the cargo tank. What is the driver's immediate and most appropriate action?Hazardous Materials Regulations
  47. 47.A driver is transporting a shipment of UN1203, Gasoline, Class 3 (Flammable Liquid), in a cargo tank. The driver needs to park the vehicle for a short rest break. Which of the following parking locations is generally PROHIBITED for a placarded vehicle carrying gasoline?Hazardous Materials Regulations
  48. 48.A driver discovers a small fire in the engine compartment of a truck that is transporting Division 5.1 Oxidizer materials. The fire is contained and has not spread to the cargo area. What is the most appropriate initial action for the driver to take regarding the fire?Emergencies and Accidents
  49. 49.A driver is transporting a shipment of Division 2.1 (Flammable Gas) and Division 2.2 (Non-Flammable Gas) in cylinders. What is the maximum number of cylinders that can be transported without requiring placards, assuming each cylinder weighs 100 pounds?Hazardous Materials Regulations
  50. 50.A driver is transporting a shipment of Class 8 Corrosive materials. During a sudden stop, a container shifts and begins to leak. The driver immediately pulls over, secures the area, and contacts emergency services. According to federal regulations, what is the MAXIMUM time a driver has to file a written HazMat incident report (DOT Form F 5800.1) after a reportable incident?Emergencies and Accidents