United States. Department of Transportation. Federal Highway Administration (2025). Move Over Law for Traffic Incident Management Using Cooperative Driving Automation (CDA) (Report No. FHWA-HRT-25-089). United States. Department of Transportation. Federal Highway Administration. https://doi.org/10.21949/n9b8-4w56
United States. Department of Transportation. Federal Highway Administration. Move Over Law for Traffic Incident Management Using Cooperative Driving Automation (CDA). Report no. FHWA-HRT-25-089. United States. Department of Transportation. Federal Highway Administration, 2025. https://doi.org/10.21949/n9b8-4w56.
United States. Department of Transportation. Federal Highway Administration Move Over Law for Traffic Incident Management Using Cooperative Driving Automation (CDA). United States. Department of Transportation. Federal Highway Administration, 2025, Report no. FHWA-HRT-25-089, ROSA P. https://doi.org/10.21949/n9b8-4w56.
The intent of a move over law is to protect first responders as they respond to an incident. When first responders are positioned near or in active travel lanes, they and their vehicles may be put in harm’s way due to the close proximity of other vehicles. All 50 States have some form of a move over law, whereby approaching users are required to slow down and move over to ensure the safety of first responders. This CDA feature allows emergency response vehicles (ERVs) to broadcast a vehicle-to-everything (V2X) message containing the global positioning system point of the incident, along with a desired speed reduction and desired safety margins for the passing vehicles. Surrounding vehicles would receive and interpret this information to avoid the lane (or space, as shown in figure 1) adjacent to the ERV and reduce their speed when passing.
United States. Department of Transportation. Federal Highway Administration (2025). Move Over Law for Traffic Incident Management Using Cooperative Driving Automation (CDA) (Report No. FHWA-HRT-25-089). United States. Department of Transportation. Federal Highway Administration. https://doi.org/10.21949/n9b8-4w56
United States. Department of Transportation. Federal Highway Administration. Move Over Law for Traffic Incident Management Using Cooperative Driving Automation (CDA). Report no. FHWA-HRT-25-089. United States. Department of Transportation. Federal Highway Administration, 2025. https://doi.org/10.21949/n9b8-4w56.
United States. Department of Transportation. Federal Highway Administration Move Over Law for Traffic Incident Management Using Cooperative Driving Automation (CDA). United States. Department of Transportation. Federal Highway Administration, 2025, Report no. FHWA-HRT-25-089, ROSA P. https://doi.org/10.21949/n9b8-4w56.
ROSA P serves as an archival repository of USDOT-published products including scientific
findings, journal articles, guidelines, recommendations, or other information authored or co-authored by
USDOT or funded partners. As a repository, ROSA P retains documents in their original published format to
ensure public access to scientific information.
Links with this icon indicate that you are leaving a Bureau of Transportation
Statistics (BTS)/National Transportation Library (NTL)
Web-based service.
Thank you for visiting.
You are about to access a non-government link outside of
the U.S. Department of Transportation's National
Transportation Library.
Please note: While links to Web sites outside of DOT are
offered for your convenience, when you exit DOT Web sites,
Federal privacy policy and Section 508 of the Rehabilitation
Act (accessibility requirements) no longer apply. In
addition, DOT does not attest to the accuracy, relevance,
timeliness or completeness of information provided by linked
sites. Linking to a Web site does not constitute an
endorsement by DOT of the sponsors of the site or the
products presented on the site. For more information, please
view DOT's Web site linking policy.
To get back to the page you were previously viewing, click
your Cancel button.