A straight line diagram (SLD) is a diagram of a road, usually produced by a highway department. The road being diagrammed is shown to scale, but as a straight line (hence the name). Features along the road including bridges and intersecting roads are shown. Rows below the diagram show data about the road, usually including speed limit, number of lanes, bridge numbers, and historical data, among other data.
An internal SLD viewing system may also include links to other internal data, including photos or plans. Public SLDs are distributed in formats including PDF and TIFF.
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