国土 こくど開発 かいはつ幹線 かんせん自動 じどう しゃ どうだったら
kokudokaihatsukansenjidōsha dōdattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 国土開発幹線自動車道

1. If it were the National Highway Network.; If it was a National Highway Network.

Tara Conditional