Check out Road Safety Barrier guard rail 3D model on CGTrader for $2. High-quality mesh by ismaelcampos2000: 238856 vertices.
STL (Stereolithography, filesize: 23.6 MB), OBJ (OBJ, filesize: 20.3 MB), BLEND (Blender, filesize: 24.5 MB), DAE (Collada, filesize: 28.7 MB), SKP (Sketchup, filesize: 45.3 MB), 3DS (3D Studio, filesize: 92 Bytes), FBX (Autodesk FBX, filesize: 6.74 MB)