prolazan

1. transient; temporary; fleeting
   Ne brini, to je samo prolazna faza. — Don't worry, it's just a passing phase.
   Slava je prolazna, prijatelji ostaju. — Fame is fleeting, friends remain.
2. (of a grade) passing
   Za prolaznu ocenu treba ti pedeset poena. — You need fifty points for a passing grade.
3. (of a room, street) through; walk-through
   Dnevna soba je prolazna, pa u njoj nema mira. — The living room is a walk-through room, so there's no peace in it.

For a road that can be travelled, the usual word is prohodan (put je prohodan), not prolazan.