高齢 こうれい運転 うんてん しゃ標識 ひょうしきでしょう
kōreiuntenshahyōshikideshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 高齢運転者標識

1. Probably a senior driver sign.; Possibly a sign for elderly drivers.

Polite
Presumptive
Conjecture