* Orbital Resonance: Pluto's orbit is in a 3:2 resonance with Neptune. This means that for every three orbits of Pluto, Neptune completes two orbits. This resonance keeps them from getting too close to each other.

* Stable Orbits: Both Pluto and Neptune have well-defined, stable orbits. They follow predictable paths around the Sun, which prevents them from colliding.

* Vast Distances: Even though Pluto and Neptune share a similar orbital plane, they are separated by vast distances. The closest they ever get is still far enough apart to avoid collision.

In conclusion: Pluto and Neptune's orbital resonance, stable orbits, and significant distance between them ensure they will not collide.