HazMat Hazardous Materials (HazMat) Endorsement Awareness 5 — Questions and Answers
Question 1: Which HazMat class covers self-reactive materials and organic peroxides that may undergo rapid decomposition?
- Class 1
- Class 4 (Correct answer)
- Class 5
- Class 8
Correct answer: Class 4
Class 4 includes flammable solids, spontaneously combustible materials, and materials dangerous when wet, while Division 4.1 covers self-reactive solids and organic peroxides are in Class 5.2.
Question 2: A HazMat package bears a label with a flame symbol over a circle. This indicates the material is a(n):
- Flammable liquid
- Oxidizer (Correct answer)
- Flammable solid
- Explosive
Correct answer: Oxidizer
An oxidizer label shows a flame over a circle (O), indicating the material can intensify combustion of other materials by supplying oxygen.
Question 3: Under what condition may a driver leave a HazMat vehicle unattended on a public street?
- Never — it must always have an attendant or be in a secure facility (Correct answer)
- Only if the parking brake is set
- If parked for less than 30 minutes
- If within sight of the driver at a rest stop
Correct answer: Never — it must always have an attendant or be in a secure facility
Vehicles carrying certain HazMat must never be left unattended on a public street; they must be attended or left in a secure, locked lot.
Question 4: What is the purpose of the Emergency Response Guidebook (ERG)?
- To record driver training certifications
- To help first responders identify HazMat and take protective actions in the first 30 minutes of an incident (Correct answer)
- To list carrier liability limits for cargo damage
- To provide route maps approved for HazMat transport
Correct answer: To help first responders identify HazMat and take protective actions in the first 30 minutes of an incident
The ERG is published by PHMSA and DOT to guide first responders during the initial phase of a HazMat transportation incident.
Question 5: When transporting Class 2.1 (Flammable Gas) materials, which action is prohibited at a loading dock?
- Using a hand truck to move cylinders
- Smoking within 25 feet of the vehicle (Correct answer)
- Checking tire pressure before departure
- Recording the tank serial number on shipping papers
Correct answer: Smoking within 25 feet of the vehicle
Smoking within 25 feet of a vehicle transporting flammable gases is strictly prohibited due to the ignition risk.
Question 6: A driver transporting hazardous materials must carry shipping papers accessible within reach while:
- Only during loading and unloading
- At all times the driver is in the cab (Correct answer)
- Only when crossing state lines
- At all times, including rest stops outside the cab
Correct answer: At all times the driver is in the cab
While driving, the shipping papers must be within the driver's reach or in the door pouch; when outside the cab, they must be in a visible location in the cab.
Question 7: Which of the following statements about compatibility grouping for HazMat loads is CORRECT?
- All HazMat classes can be loaded together as long as quantities are small
- Certain HazMat classes must be separated to prevent dangerous reactions if they leak or mix (Correct answer)
- Class 3 and Class 8 materials are always compatible for co-loading
- Only explosives require segregation from other HazMat classes
Correct answer: Certain HazMat classes must be separated to prevent dangerous reactions if they leak or mix
DOT segregation tables specify which HazMat classes and divisions cannot be loaded, stored, or transported together because contact could cause fire, explosion, or toxic gas release.
HazMat Hazardous Materials (HazMat) Endorsement Awareness 5
Which HazMat class covers self-reactive materials and organic peroxides that may undergo rapid decomposition?