According to ERG guidelines, what color indicates initial isolation?

The color that indicates initial isolation according to the Emergency Response Guide (ERG) guidelines is orange. This color is specifically designated in the ERG to signal responders to create a safety perimeter around a hazardous material incident, thereby helping to prevent exposure to harmful substances. By establishing this initial isolation zone, responders aim to protect both themselves and the surrounding public from potential hazards associated with materials that may be present.

In the context of emergency response, adhering to these color codes is critical for effective communication and safety management during an incident. For example, while blue is often associated with other information within the guide, and yellow may indicate specific actions or hazards, orange is the definitive hue that immediately conveys the need for isolation. The correct understanding and application of these color codes enhance the effectiveness of emergency response efforts.