国土 こくど開発 かいはつ幹線 かんせん自動 じどう しゃ どうだろう
kokudokaihatsukansenjidōsha dōdarō

Noun
Da Copula

Expresses probability ("probably…") of 国土開発幹線自動車道

1. Probably the National Highway Network.; Probably a national development expressway.

Presumptive
Conjecture