This happen me too, south of Chalkeia 203111, the bridge with the metal barrier on the sides, if you it them of if you drive on it the bridge will disappear/collapse.
This happen with vehicle bigger then cars (Trucks, Tank).
This is the bugged bridge:
http://i1204.photobucket.com/albums/bb409/privitan/ARMA3%20BUGS/arma3BuggedBridge800x450.jpg