90 speed limit 3D model is available on CGTrader for $2. Original author: cagdasc. Specs: 35402 polys, 106206 verts.
SKP (Sketchup, filesize: 1.57 MB), BLEND (Blender, filesize: 3.64 MB), OBJ (OBJ, filesize: 2.33 MB), FBX (Autodesk FBX, filesize: 744 KB), GLTF (glTF, filesize: 1.3 MB), ABC (Alembic, filesize: 2.15 MB), DAE (Collada, filesize: 2.57 MB), STL (Stereolithography, filesize: 1.69 MB)