What does the 'X' designation indicate regarding explosives in transportation?

The 'X' designation in the context of explosives transportation indicates that specific guidelines and restrictions apply to how these substances can be handled. Particularly, it signifies that the explosives must not be carried on the same vehicle as other explosive materials unless they belong to the same compatibility group. This safety measure ensures that incompatible explosives do not pose a risk during transportation, as they may react adversely if exposed to one another.

In transportation regulations, the 'X' designation is crucial as it helps reinforce safety protocols, ensuring that potentially hazardous materials are appropriately segregated. This minimizes the risk of unintended detonations and enhances overall transportation safety for both drivers and the general public.