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In May 2004, FHWA published guidance on the use of changeable message signs (CMS) which included: recommendations on the display of AMBER alerts, emergency messages, and information on travel times. The purpose of this study was to provide operational guidance to transportation agencies as to the use of changeable message signs to display travel time information, emergency or security alerts and child abduction alerts. Information was gathered through a series of interviews conducted with representatives from State Departments of Transportation (DOTs) and Federal Highway Administration Division Offices.

One issue that was addressed in the document was the use of AMBER alerts and how the majority of states were broadcasting these alerts using CMS. The purpose of the guidance was to provide best practice information to transportation agencies to improve the use and consistency of CMS messaging in the United States.

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US Department of Transportation
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Amber, Emergency, and Travel Time Messaging Guidance for Transportation Agencies
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