According to Osho, 'encountering a Buddha on the road' means meeting the master or any mental image of enlightenment; you must 'kill' it—let go of the teacher and the concept—once it has served, or it becomes bondage. The master is a ladder/boat, a door; use it to cross, then drop it to realize your own Buddha-nature, beyond duality and possessive devotion.
Learn from a wise guide, then stop clinging—even to them or your ideas—so your own wisdom can shine.