Hello Ma'am,

I found the following exchange on another site concerning your question of the different colours for the ribbons. I  hope this helps.

v/r

Dave

In a traditional sense, here is the typical color breakdown. Green - Sanitary Sewer Blue - waterline (watermain) Yellow - Gas (or petroleum) Orange - construction staking (also fiber optic) Red - electric Pink - Survey control (typically includes property corners, also common for wetland delineation) White - 'limits' They also make a "checkered" pattern flagging that could mean anything. Then one could use any mixture of the colors (i.e. CHK has blue AND orange ribbon on their pipeline PI's when constructing a new line). As someone previously stated, color isn't as important as the writing on the stakes. A blank stake down a median is probably for some type of feasibility study that isn't being made public. Or it could simply mark the center of construction for the roadway. You just never know. :)