"National Freight Transport Survey" is a logistics version of National Census. It aims to survey every nationwide movement of cargo within Japan. This is executed by Japanese government – Ministry of Land, Infrastructure, Transport and Tourism (MLIT) in support of NXLRIC. The survey is conducted every 5 years and a key statistics for many Japanese industries.
Survey results are published and can be obtained from the MLIT site.
https://www.mlit.go.jp/sogoseisaku/transport/butsuryu06100.html (Japanese only)