Wikipedia:WikiProject U.S. Roads/Resources/Lengths

Lengths	Shortcut WP:USRD/L
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related changes—v · d · e

This page is for determining the precise length of a numbered route. The majority of information is to at least two decimal places, so that should probably be a good standard.

ArcExplorer is a good free GIS viewer for the states that use GIS data.

"Show your work" on the talk page of the article if it is complicated - for instance Talk:U.S. Route 30. Always cite the source with a footnote in the article. Or see User:Mxn/Citing a feature in an ArcGIS map