baltimore county _ families. brent howard from the baltimore county chamber- families. brent howard from the baltimore county chamber of. baltimore county chamber of commerceor andrew barr from sheffield university's civil and structural engineering department. and of course all eyes are on whether this was a structurally sound bridge. andrew, what is your view of what happened and why the whole bridge more or less should collapse so quickly having been hit by that cargo vessel? the collapse so quickly having been hit by that cargo vessel?— by that cargo vessel? the videos that we have _ by that cargo vessel? the videos that we have seen _ by that cargo vessel? the videos that we have seen are _ by that cargo vessel? the videos that we have seen are of- by that cargo vessel? the videos that we have seen are of the - by that cargo vessel? the videos i that we have seen are of the central part of a much larger bridge. but this central part is a truss structure, a lattice type structure you can see, it is a trust, and it is continuous over the three spans of the bridge. that is obviously acting as one structural piece. —— truss. what has happened is when that