What does this word I just heard online mean? Travel radius?

Tourism radius generally refers to a circle-like range formed by taking a certain source of tourists as the center and the distance to areas where people can travel as the radius. Also called travel radius. Generally speaking, the unit of travel radius is kilometers. For example, in the United States, the radius of family car travel is about 800-1500 kilometers. The vast majority of family car travel in my country is still around 80-150 kilometers. At present, with the improvement of the traffic environment, the measurement unit of travel radius has also begun to convert to the time unit. For example, with Shanghai as the center, the spatial range of the travel radius within 3 hours is very different.