That may be passed through or crossed.

Of a building: †able to be entered, penetrable (obsolete). Of an area, region, etc.: that can be traversed, passable. Now rare.

Able to be passed or crossed; suitable for the passage of people, vehicles, or animals.

Of a road, region, etc.: able to be travelled.

Feasible. Also (literal): passable.

Capable of being passed through; pervious.

Admitting of being passed through or over; capable of being crossed.

gen. Allowing passage through; offering passage or entrance; lying open to.

Open to traffic.

That may be traversed or crossed. Also figurative.

Of a route, passage, entry, etc.: able to be used or traversed; that can be passed.

Traversable.

That can be crossed.

Of an obstacle: that can be cleared, crossed, or avoided. Also, of a route, etc.: that can be followed (usually with difficulty).