A Tool to Aid Practitioners in Determining Appropriate Speed Limit Recommendations
USLIMITS is a web based tool designed to help practitioners set reasonable, safe, and consistent speed limits for specific segments of roads. USLIMITS is applicable to all types of roads ranging from rural local roads and residential streets to urban freeways.
User-friendly, logical, and objective, USLIMITS2 is of particular benefit to local communities and agencies without ready access to engineers experienced in conducting speed studies for setting appropriate speed limits. For experienced engineers, USLIMITS2 can provide an objective second opinion and increase confidence in speed limit setting decisions.
New Project
Before beginning a new project, it is recommended that you read through the User Guide and be prepared to enter the necessary data (e.g., 50th and 85th percentile speed, roadway characteristics, and crash history).
To create a new project, click the new project link below. At the end of the process you will be asked to save a project file. The project file can be revised or updated later.
Existing Projects
If you wish to revise or update an existing project, click the revise project link to upload your project file.
Revise Or Update An Existing Project
Additional Resources
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 recommend speed limit.
NCHRP 3-67 Project Report - documents the research conducted to develop version 2 of USLIMITS.
Frequently Asked Questions - frequently asked questions for version 2 of USLIMITS.
Technical Support
If you experience any technical difficulties while using this program, find any bugs, or have suggestions for improving USLIMITS, please send an email to help@uslimits.org.
