Final answer:
The color on the back of a tanker truck signifies safety information and potential hazards, with colors like fluorescent green or orange indicating high visibility and caution.
Step-by-step explanation:
The color of a sign on the back of a tanker truck communicates important safety information to other motorists. These colors are not only visually attention-grabbing, but they also align with a system of color coding that conveys specific meanings. For example, fluorescent green or neon colors are highly visible in different light conditions, which can indicate caution or signal the presence of potentially hazardous materials.
The color orange is similarly used for safety purposes, often seen in construction or signs that mark changes in driving conditions. Therefore, if a tanker truck features one of these colors, other motorists are alerted to exercise caution or be aware of specific hazards associated with the truck's contents.