> a ladder, parallel to the ground, travelling horizontally at relativistic speed (near the speed of light) and therefore undergoing a Lorentz length contraction
From the page on Lorentz length contraction:
> For standard objects, this effect is negligible at everyday speeds, and can be ignored for all regular purposes, only becoming significant as the object approaches the speed of light relative to the observer.
I'm pretty sure this means that one of the observers sees the ladder at the full length, since relative to them the ladder's speed is 0.
> a ladder, parallel to the ground, travelling horizontally at relativistic speed (near the speed of light) and therefore undergoing a Lorentz length contraction
From the page on Lorentz length contraction:
> For standard objects, this effect is negligible at everyday speeds, and can be ignored for all regular purposes, only becoming significant as the object approaches the speed of light relative to the observer.
I'm pretty sure this means that one of the observers sees the ladder at the full length, since relative to them the ladder's speed is 0.