Milepost equation
Encyclopedia
A milepost equation, milepoint equation, or postmile equation is a place where mileposts on a linear feature, such as a highway
or rail line, fail to increase normally, usually due to realignment or changes in planned alignment. In order to make mileposts consistent with the real mileage, every milepost beyond the equation would need to be moved.
For example, an equation of 7.6 back = 9.2 ahead means that the feature does not have any section between mile 7.6 and mile 9.2, and the distance between mileposts 7 and 10 is only 1.4 miles. This would usually be caused by a relocation that shortened the distance by 1.6 miles. It is also possible for an equation to add mileage to what it would otherwise be; the duplicated mileposts receive a special prefix, such as Z.
Highway
A highway is any public road. In American English, the term is common and almost always designates major roads. In British English, the term designates any road open to the public. Any interconnected set of highways can be variously referred to as a "highway system", a "highway network", or a...
or rail line, fail to increase normally, usually due to realignment or changes in planned alignment. In order to make mileposts consistent with the real mileage, every milepost beyond the equation would need to be moved.
For example, an equation of 7.6 back = 9.2 ahead means that the feature does not have any section between mile 7.6 and mile 9.2, and the distance between mileposts 7 and 10 is only 1.4 miles. This would usually be caused by a relocation that shortened the distance by 1.6 miles. It is also possible for an equation to add mileage to what it would otherwise be; the duplicated mileposts receive a special prefix, such as Z.