How to distinguish the inner ring from the outer ring

Inner ring and outer ring can be distinguished by traffic flow and road function.

The inner ring is the ring road in the central area of the city, which mainly undertakes the function of urban internal traffic. Usually, the traffic flow is large and the road width is wide, connecting the main commercial, administrative and cultural centers of the city. The outer ring is a circular road around the central area of the city, which mainly undertakes the traffic connection function between the city and the surrounding areas. Usually, the traffic volume is relatively small and the road width is relatively narrow. The road between the inner ring and the outer ring is usually the main road connecting the inner ring and the outer ring, which bears the transition and diversion of traffic flow.