{cripu} = x1 is a bridge/span over/across x2 between x3 and x4 [unordered, typically destination first]. See also bargu, kruca, ragve, kuspe.
What is destination? The direction of the road traffic on the bridge or the direction the bridge was built in?
Imagine:
{puente} = x1 is a bridge/span over/across points x2 (plural, use {jo'u}). See also bargu, kruca, ragve, kuspe.
Sometimes bridges can span over more than two points (a more rare case but still stands).
It looks like {cripu} is describing a more rare case than "bridge" in general.
A similar question for {vorme3} vs. {vorme4}. Why not merging them into one "plural" place?
Yet another question is about mosra2 and mosra3. It sounds like mosra3 is immobilized and mosra2 is rubbing against it.
But here {simxu lo ka ce' ce'u te mosra} would solve the problem.
The same for tavla1/tavla2 (and not casnu1) where the relation isn't equal.