The model was created in Blender. Most preview photos rendered with EEVEE.In the blend file, all objects has all the modifiers UNapplied, therefore it is very easy to modify the model.Most of the materials are procedural, it is not UV unwrapped, thera are NO textures included in the files(except the road). The FBX and OBJ formats has no textured material applied!
The models are not highly detailed, many objects arrayed :374.000 faces, 794.000 tris.
For blender users:The model contains 2 groups of object, The main body, and end body. They are in collections, and instancing them in blender allows you to easily create as lond bridge as you want. Both sections are 150 m long, there are 2 bounding box help you to identify the sections lenght.They are hidden fom render.