Unless it is a very small bridge, it would be wide enough to let a vehicle pass a wreck.
In RL there will very likely be wrecked cars and trucks on every road and bridge.
If tanks can't pass a wreck, they will push it over the aside or out of the way rather than make a 4 or 5 km detour.
If they can't move it, they will call for engineers before detouring.
Proposed solution:
A) wrecks should not count towards stacking limits
B) eliminate stacking limits.
From TacOps Gazette by its developer:
<<Are there stacking rules in TacOps?>>
No. I rely on enemy artillery to discourage stacking.
and..
[There is no need to have the game enforce stacking limits. Your opponent's artillery will generally drive the lesson home about not bunching up.]



