as a civil engineer from leibnitz a university in hanover welcome to d.w.p. now you're a bridge designer yourself this is a bridge that's been repaired and renovated several times since it was opened in one thousand nine hundred sixty seven is that unusual it's actually not that unusual to repair and to maintain budgets in the procedure of the ring operation of . highways and freeways and so obviously an inquiry has begun what are some of the most likely theories about how this came to happen of course these questions all know but now it's actually only assumptions or speculation possible but if you see that structure and if you see the special conditions we had during the accident we had very severe weather conditions so a score could be happening during such and. what might have happened saw. the earth could. go away from the foundation for us and that leads to that could lead to problems and then the bridge of course is quite all of this from the sixty's so we have a lot of maintenance problems with these bridges in europe in general and that aeration of t