CDL Hazardous Materials Endorsement (HME)Hazardous Materials RegulationsEasy
A driver is transporting a bulk quantity of UN1950, Aerosols, Class 2.1 (Flammable Gas), in a cargo tank. According to hazardous materials regulations, how must the driver ensure the cargo tank remains attended?
- AThe driver must remain within 100 feet of the vehicle and have an unobstructed view of it.
- BThe driver must remain within 200 feet of the vehicle and have an unobstructed view of it.
- CThe driver must remain within 50 feet of the vehicle and have an unobstructed view of it.
- DThe driver must remain within 25 feet of the vehicle and have an unobstructed view of it.
Show answer & explanationAnswer & explanation
Correct answer: C. The driver must remain within 50 feet of the vehicle and have an unobstructed view of it.
For cargo tanks containing Division 2.1 (Flammable Gas) materials, federal regulations require the driver to remain within 50 feet of the vehicle and maintain an unobstructed view. This ensures immediate response in case of an incident.
Why the other options are wrong
- A. This distance is incorrect for flammable gas cargo tanks.
- B. This distance is incorrect for flammable gas cargo tanks.
- D. This distance is incorrect for flammable gas cargo tanks.
Attended Vehicle (Flammable Gas/Liquid Cargo Tanks)
A hazardous materials cargo tank carrying certain flammable gases or liquids is considered 'attended' when the driver is within a specific distance and has an unobstructed view of the vehicle.
- Required for cargo tanks containing Division 2.1 (flammable gas) or Class 3 (flammable liquid) materials.
- Driver must be within 50 feet of the vehicle.
- Driver must maintain an unobstructed view of the vehicle.
- Ensures immediate intervention in case of a leak or other incident.
Memory trick: Fifty feet, clear sight, safe night.