evacuationZoneRadius_km

Given a predicate that represents a relationship or action between entities, generate a one-sentence description explaining its meaning.  
# Instructions
Focus on describing the relationship, not the entities themselves. 
# Response Format
Begin the description with \' Indicates...\'

Predicate: evacuationZoneRadius_km

Indicates the distance, in kilometers, from a central point within which people or assets must be evacuated or kept clear.