国土 こくど開発 かいはつ幹線 かんせん自動 じどう しゃ どうでしょう
kokudokaihatsukansenjidōsha dōdeshō

Noun
Desu Copula

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

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

Polite
Presumptive
Conjecture