Hi bigseb - well the bridge looks like it is a bit longer in proportion and shallowly curved - often times things that are shaped like that do not quite get enough triangles created for them when the metric being used is a maximum allowed angular measurement between the surface normals at the triangle vertices.

When MoI generates a mesh there are some other options available like putting in a distance value that can be used for refining down polygons that would be larger than a certain size - look for something kind of parameters similar to that.

- Michael