What does the traditional statistical data source of population mobility not include?

The traditional statistical data sources of population mobility do not include traffic data. According to relevant public information, it has nothing to do with traffic and does not contain traffic data. Floating population can be divided into inflow population and outflow population Inflow population refers to the non-registered population who came to the area, and outflow population refers to the registered population who left the area to live in other places. Floating population can be divided into permanent floating population and short-term floating population according to liquidity.