Intelligent Speed Assistance: A New Tool for Safer Roads

An official website of the United States government. Here's how you know

The .gov means it's official.
Federal government websites always use a .gov or .mil domain. Before sharing sensitive information online, make sure you’re on a .gov or .mil site by inspecting your browser's address (or "location") bar.

This site is also protected by an SSL (Secure Sockets Layer) certificate that's been signed by the U.S. government. The https:// means all transmitted data is encrypted — in other words, any information or browsing history that you provide is transmitted securely.

June 29th, 2026

Speeding remains one of the most persistent and deadly threats on U.S. roadways. GHSA has produced a comprehensive new guidebook to help states use Intelligent Speed Assistance technology to combat this preventable behavior.

The guidebook details steps and actions for State Highway Safety Offices (SHSOs) to help support and advance the adoption of active Intelligent Speed Assistance (ISA). This in-vehicle technology identifies the posted speed limit and ensures the driver does not exceed it. Speeding has historically been difficult to manage through roadway design alone, but ISA provides a proactive, technology-driven intervention that can reduce crash risk and injury severity.

Intelligent Speed Assistance: A New Tool for Safer Roads