Which type of fireworks is not allowed to be loaded on the same vehicle with Division 1.1 explosives?

Division 1.4S fireworks are classified as having a low hazard potential, which means they are designed to produce a limited explosion and do not pose a significant risk of mass detonation. However, when it comes to transporting hazardous materials, regulations are strict regarding the compatibility of different types of explosives.

The regulations prohibit loading Division 1.4S with Division 1.1 explosives because Division 1.1 includes materials that can cause a mass explosion, which poses a much greater risk. The incompatibility is based on safety considerations, as a mass detonation of Division 1.1 explosives could lead to catastrophic consequences if combined with materials that, while less dangerous, could still react or exacerbate the situation under specific conditions.

The correct answer indicates an adherence to safety protocols during the transportation of hazardous materials, ensuring that more hazardous types of materials like Division 1.1 are kept separate from those that are less hazardous, such as Division 1.4S. This separation is vital for minimizing risk during transport.