落石が道路をふさいだ。

falling rocks; fallen rocks

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

road; highway

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to stop up; to close up; to block (up); to plug up; to shut up; to cover (ears, eyes, etc.); to close (eyes, mouth); to stand in the way; to obstruct; to occupy; to fill up; to take up; to perform one's role; to do one's duty; to feel depressed; to mope