This specific 3D model, "Concrete barrier Low-poly 3D model 9", is an asset made available by "Unknown author".
Can be downloaded at "Unknown platform" by following the link.
The license for this digital asset is "Unknown license".
BLEND (Blender, filesize: 948 KB), OBJ (OBJ, filesize: 1.04 MB), FBX (Autodesk FBX, filesize: 20.8 KB), GLTF (glTF, filesize: 50.1 KB), DAE (Collada, filesize: 21 KB), STL (Stereolithography, filesize: 8.09 KB), ABC (Alembic, filesize: 11.8 KB)