The Straight Line Diagrams were recently updated to include all
roadway changes as of January 1, 2009!

Welcome to the Ohio Department of Transportation's Office of Innovation, Partnerships, & Energy. 

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.

SLD's can be selected by county or route number using the links to the left.

All information contained in the SLD files is current as of January 1, 2009.  Interim SLD updates may be available during the year.  To obtain, contact Norm Welch of the Roadway Information Section.

Design and creation of this application was completed by