noun
automobile weight tax
A Japanese national tax levied on motor vehicles based on their weight, paid at the time of mandatory vehicle inspection (車検).
車検のときに自動車重量税を納めなければならない。
You must pay the automobile weight tax at the time of vehicle inspection.
自動車税 is an annual prefectural tax based on engine displacement, while 自動車重量税 is a national tax based on vehicle weight paid at inspection.
Compound of 自動車 (automobile), 重量 (weight), and 税 (tax).