The United States Department of Homeland Security website gives a definition of what "orange" means in their advisory system and what precautions should be taken:

High Condition (Orange)

A High Condition is declared when there is a high risk of terrorist attacks. In addition to the Protective Measures taken in the previous Threat Conditions, Federal departments and agencies should consider the following general measures in addition to the agency-specific Protective Measures that they will develop and implement:

- Coordinating necessary security efforts with Federal, State, and local law enforcement agencies or any National Guard or other appropriate armed forces organizations;

- Taking additional precautions at public events and possibly considering alternative venues or even cancellation;

- Preparing to execute contingency procedures, such as moving to an alternate site or dispersing their workforce; and

- Restricting threatened facility access to essential personnel only.