Roundabouts have caught on in the US at such a pace that it is impossible to keep this page current. This site contains our research prior to 2003. Access our research by clicking on the yellow states.

For more up-to-date information, we suggest you contact the Department of Transportation for a particular state. Many state DOT’s can be reached at the generic address: www.dot.state.(insert the two-letter state abbreviation) us. For example, www.dot.state.ak.us, www.dot.state.mn.us, and www.dot.state.wi.us