What is a correction line?

Correction Lines are designed to adjust for the curvature of the earth, so roads north of a correction line and roads south of a correction line may not line up. When reading a map, determine if the location or destination is above or below the Correction line. For locations above the Correction Line, read the top of the map to find out the Range Line. Similarly, for those locations below the Correction Line, read the bottom of the map to find the Range Line. When travelling along the Correction Line, you may see two signs at each intersection instead of the single sign seen throughout the remainder of the County. Just remember, if your destination is north of the Correction Line, read the sign at the north of the intersection. If you are turning south, heed the sign on the south side of the intersection. 

Correction Line Map

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1. What is a range road/township sign?
2. How do I read a range road/township sign?
3. What is a correction line?