primaryRingRoad

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: primaryRingRoad

Indicates that a road functions as the main circumferential or loop route encircling or bypassing a central area in a transport network.