September 2017 

USLIMITS2 : A Tool to Aid Practitioners in Determining Appropriate Speed Limit Recommendations

USLIMITS2 is a web-based tool designed to help practitioners set reasonable, safe, and consistent speed limits for specific segments of roads.

This is applicable to all types of roads ranging from rural local roads and residential streets to urban freeways.

New Projects and Entry Forms

The project entry form prompts the user to enter various data. Before beginning a new project, users should read through the online User Guide and be prepared to enter the necessary data (e.g., 50th and 85th percentile speed, roadway characteristics, and crash history).

Additional Resources

The website also includes information on Decision Rules, with flowcharts that explain the decision logic used in determining the recommended speed limit, a Frequently Asked Questions section, and the research report that documents developing USLIMITS2.

(Disclaimer: The U.S. Government assumes no liability for the use of the information contained in this tool. This tool does not constitute a standard, specification, or regulation.)


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