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A straight-line diagram (abbreviated SLD) is a diagram of a road where the road is shown as a straight line. Such diagrams are usually produced by a highway department, and display features along the road, including bridges and intersecting roads. Rows below the diagram show data about the road, usually including speed limit, number of lanes, bridge numbers, and historical data, among other data. Subway lines also frequently employ straight-line diagrams.
In Australia, "strip maps", which serve a similar function, are distributed by state automobile associations.
- Colorado Department of Transportation SLDs
- Florida Department of Transportation SLDs
- New Jersey Department of Transportation SLDs
- North Carolina Department of Transportation SLDs
- Ohio Department of Transportation SLDs
- Index of Australian strip maps at the South Australian Royal Automobile Association website
- Sample South Australian RAA strip map from Adelaide to Clare