If the next control segment starts at 1.94 miles, the marker at 1.80 will be placed but the marker at 1.90 miles will not. On divided highways, one direction of travel is inevitably longer than the other. If the opposite direction is the longer alignment, its markers will be spaced at greater than tenth-mile intervals. If it is the shorter, they will be spaced at less than tenth-mile intervals. This way, identical markers are always placed directly opposite each other on divided highways.
Markers are often absent due to an accident, vandalism or maintenance work.
All text and images created by N. W. Perry unless otherwise credited.