Who Is Mile Markers?

Mile markers, or mileposts as they are also known, are the vertical green signs on the edge of highways placed at one-mile intervals. Mile marker numbering begins at the most southerly or westerly point in a state.

What does the mile marker tell you?

These "mile markers" show the number of miles from where the Interstate route entered the state in which you are traveling. The counting always begins at the state line in the south (for north-south routes) and in the west (for east-west routes). So, mile marker numbers always get larger as you travel east or north.

How accurate are mile markers?

Steering to your query, Richard, mile-marker installers use land-surveying techniques to establish the distances. ... Young said the tenth-mile markers "may not be 100 percent accurate; there may be some that are a little bit off," but they're close enough to ensure that first responders arrive as quickly as possible.