Billboard Height Above Grade and Why Elevation Changes What Drivers See
Why Two Billboards With the Same Traffic Count Perform Differently Billboard height above grade is how far a sign face sits above the ground beneath it. It matters because elevation decides when a driver first sees the board and how long the face stays in view. Two boards on the same road with the same traffic count can deliver very different viewing times. That gap is what confuses buyers. You pull up two locations, the counts look nearly identical, and one is priced higher or described as the better site. Nothing on the spec sheet explains why. The answer is usually vertical. Traffic counts measure how many people drive past. They say nothing about how many of those people can actually see the face, or for how long. Elevation is one of the biggest reasons those two numbers come apart, and it is one of the least discussed variables in out-of-home advertising. This post covers the geometry of vertical positioning. It is not about who drives by, and it is not about how big your letters ...