In December 1995, Congress repealed the National Maximum Speed Limit (NMSL), which had been 55 mi/h on urban Interstates and 65 mi/h on rural Interstates and certain rural Interstate look-alikes. Full authority to set posted speed limits on all public roads returned once again to State and local governments, ending 20 years of Federal involvement with national speed limits. The National Highway System Designation Act of 1995 (which contained the repeal) also ended the requirement that States provide travel speed data to FHWA; Congress had linked noncompliance with the NMSL to possible loss of Federal funds. In 1997, the U.S. DOT developed the formal speed policy and implementation strategy in use today.

  • Speeding and Highway Safety Brochure [HTML, PDF 514 KB]

Program Contact

Guan Xu


What’s New

Speed Management Program Plan NEW

Guidelines for the Use of Variable Speed Limit Systems in Wet Weather


USLIMITS2 a web based tool for recommending speed limits

Speed Management Webinars

Methods and Practices for Setting Speed Limits: An Informational Report

Procedures for Setting Advisory Speeds on Curves

State Practices to Reduce Wet Weather Skidding Crashes

Speed Concepts: Informational Guide

Speed Management Information Resources

Analysis of Speeding-Related Crashes (PDF 594 KB)

Engineering Countermeasures for Reducing Speeds: A Desktop Reference of Potential Effectiveness

Traffic Safety Facts: Speeding – 2011