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The examples and perspective in this article deal primarily with Canada and the United States and do not represent a worldwide view of the subject. You may improve this article, discuss the issue on the talk page, or create a new article, as appropriate. (July 2018) (Learn how and when to remove this template message)
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The seal of the United States Department of Transportation, the largest of all DOT's
. Some states have based their DOT logo after this one, such as that of Iowa and North Carolina.
The Department of Transportation (DOT) is the most common name for a government agency in Canada or the United States devoted to transportation. The largest is the United States Department of Transportation, which oversees interstate travel and is a federal agency. All U.S. states, Canadian provinces, and many local agencies also have similar organizations and provide enforcement through DOT officers within their respective jurisdictions.
The DOT's mission statement claims that an "efficient and modern transportation system " to "improve the quality of life for all Americans" is their goal. 
Canadian provincial departments of transportation
The Transport Canada logo