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FHWA Highway Safety Programs

USLIMITS2 - Technical Support

If you experience any technical difficulties while using this program, find any bugs, or have suggestions for improving USLIMITS2, please send an email to

FHWA also offers FREE technical assistance to State and local agencies that are interested in learning more about using USLIMITS2 or about setting safe speed limits. This includes answering questions, providing in-person workshops, providing virtual workshops held via web conference, and giving presentations. To request technical assistance, send an email to

Please also review the following documents for more information about using USLIMITS2:

  • User Guide; – provides background information and detailed instruction for using the USLIMTS2 web-based tool.
  • Decision Rules – flowcharts of the decision logic used in determining the recommended speed limit.
  • NCHRP 3-67 Project Report – documents the research conducted to develop version 2 of USLIMITS2.
  • Frequently Asked Questions – frequently asked questions for version 2 of USLIMITS2.