CDL Hazardous Materials Practice Test

When is it required for the driver to have an approved gas mask on hand?

1. When transporting compressed gases

2. When carrying chlorine

3. When carrying explosives

4. When transporting flammable liquids

The correct answer is: When carrying chlorine

Having an approved gas mask on hand is crucial when carrying chlorine, as it is classified as a toxic inhalation hazard. Chlorine can pose serious health risks if inhaled, and a gas mask is essential for protection against its harmful effects. This requirement is part of the safety measures intended to protect drivers in the event of a leak or spill that could result in exposure to the gas. While other choices might involve hazardous materials, they do not specifically necessitate a gas mask for the driver's protection due to the nature of the hazards they present. For instance, transporting compressed gases and flammable liquids has different safety equipment requirements, and explosives are governed by other regulations, focusing more on containment and avoidance of shock-sensitive conditions. Thus, each material falls within a unique category of risk, with chlorine being especially dangerous in terms of inhalation.