Select the division of Hazard Class 1 that is the most dangerous.

Hazard Class 1 is the classification for explosives in the Department of Transportation regulations. Among the divisions within this class, Division 1.1 is recognized as the most dangerous. This division includes materials that have a mass explosion hazard, which means that, when initiated, these explosives can produce a widespread detonation that affects a large area and poses the highest level of risk to people and property.

The nature of 1.1 explosives requires strict safety measures due to their potential to cause catastrophic events, impacting not only the immediate vicinity but also surrounding environments. This makes Division 1.1 materials critical to handle and transport with utmost caution, ensuring that they are properly secured and kept away from flammable or reactive materials.

Other divisions, such as 1.2, 1.3, and 1.5, have hazards associated with them, but they do not possess the same level of danger as Division 1.1. For example, 1.2 involves explosives that do not have a mass explosion hazard but may still produce a projectile hazard. Therefore, when considering the overall risk and potential impact, Division 1.1 is indeed the most dangerous within the Hazard Class 1 category.