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Straight Line Diagrams

A Straight Line Diagram (SLD) is a two dimensional graphic representation of the physical roadway characteristics of a highway as if it had no turns or curves. Mileage is based on the centerline of the roadway as measured from the western or southern county line or other true beginning. All routes on the Interstate, U.S. and State Route systems are shown on these diagrams.

The following documents are available for download:

Straight Line Diagrams Read Me

Straight LIne Diagrams Legend

For questions, please contact:

Ethan Pointer

Aaron Shvach


In the table below, if you know your route number, just put it in the search to find files related to the route numbers. Or use the filters at the top of the table to organize columns alphabetically or categorically.