Am I the only one who thinks that the bridge has way too many polys for this small size ? Try to model the bridge again with less polys. Do the Details with “Normal Maps” and “Displacement Maps” for more Detail. You can somehow bake the Normal Map of a high res Model onto the LowPoly Model in 3dsMax… It`s just a tip. If you want to stick to the HighPoly Version i strongely recommend a LOD1 (Level of Detail) Model with less Polys. Otherwise you will definetily mess up your Framerate when get like 100 Objects per Scene…