Red, Green, And Blue
A red stripe on the floor, for example, indicates that an electric power line is just beneath the surface. A green marker, on the other hand, denotes the presence of a sewer or drain, while a splash of blue denotes the presence of a water pipe. But that’s not all; a variety of many other colors, such as purple, must also be considered.
White Marks
White markers, for example, can be found on the street, but they should not be perplexed with the basic white lines that run down the center of the road. In this case, the streaks represent possible evacuation routes in the event of an emergency.