The private automobile has had a profound effect on human life in the last century or so. During that time, urban environments have been reshaped significantly by changes relating to cars, car ownership, traffic patterns and car-related infrastructure. As city planners grappled with traffic issues, they regularly produced maps illustrating existing traffic patterns.

Physical copies of many items in this collection are held by Multnomah County Library. However, the library does not hold the copyright to these items. Copyright usually resides with the creator(s) of the items. Any information about copyright for items in this collection will be noted in the metadata and Rights & Usage field for each item.

The copyright law of the United States (Title 17, United States Code) governs the making of photocopies or other reproductions of copyrighted material. It is the responsibility of any users of this digital collection to determine whether their intended use of an item is acceptable under copyright law.

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