Vehicles - completely non-functional, rusty chunks of ore. But some plastic parts will survive just fine. So it will be more like a blobs of iron and zinc ore with cool plastic parts inside. Sponge of the seats will desintegrate, plastic hard panels of the front and doors will remain intact but somewhat brittle. Lots of plastic in engine parts and fuel system will remain fully intact. Rubber wheels will become very brittle, but will mostly hold its shape. Plastic tanks and pipes can be used, if new clips are used, and pipes are not bent, as they will become brittle too. Plastic tanks remain intact. Gasoline and diesel will become waxy and unusable for a car. Water may remain in a screenwash tank. Radiator system will rust away and lose coolant. Oil will be mixed with motor's rusty remains.
Road signage - somewhat functional, metal including the pole and tension ring will rust away and fall off. Plastic will remain as is, probably on the ground nearby, but will be covered in dust. Careful wiping of the dust can reveal bright colors as today. Plastic of this type will still likely be brittle, unlike some car parts.
Windows - Somewhat functional. Glass is intact. Inner gas pocket seal is broken, so they provide no thermal insulation. Inner aluminium frame will oxidize, but outer PVC frame will stay. Hinges will oxidize. Windows will stay in place, but wont keep warmth, and will fall off as a whole unit when touched. Window will be covered in dust and not let the light through. When fall it will shatter completely into small chunks, as PVC loses its flexibility additives, glass shatters normally, and oxidized aluminium is dust anyway.
Electronics - completely non functional. component leads (legs) will rust away. Copper surface will oxidize and become green. Solder may stay intact. Plastic will stay intact - all the element shells. Elements' remains will remain in place, but without any attachment to the board will easily fall off when touched. Plastic parts and ferrites will stay intact, but not that useful without leads or the board. Ferrite cores could be used. Long pieces of copper wire will remain okay-ish, as only ends will oxidize. So ferrite core and copper wire could be used to wind up a transformer.
buildings - many will stay functional. Skyscrapers will fall because of steel rusting away. One story wooden houses will fall because wood is eaten away. But dumb and ugly 5-9 story concrete blocky buildings are likely to stay as is, it is just concrete and it is not affected. Old stone buildings like churches also have a good chance to stay as is, losing its wooden roof but remaining mostly functional.
Overall everything will be covered in a sticky grey dust, no bright colors to see when flashlight is turned on unless dust is wiped. No transparent things either. No complex plants either, more like moss and fungi. Most common entity that survived will be advertising objects: plastic cards, plastic 'paper', plastic signs outside the business, plastic emblems, price signs, plastic packaging and labels for goods, door numbers, cheap plastic chairs and toys.
Glowing mushrooms is a thing, and can grow there too. No need for those, but they look cool.
Some insects may survive eating what remained of those who decomposed the wood.
Some reptiles could theoretically survive at extremely slow metabolic rate, but this is pushing the limit.
Warm bloded animals cant survive on such a low metabolic rate. So no birds, no mammals.
Could replace rodents with large spiders to keep the 'ewww', but also not throw away the realism. They wont be fast though. Movement is restricted to 1 cm/s at most, likely even less, due to metabolic rate limitation. Faster creatures will starve to death.
Chemotrophs are likely to dominate in such conditions. In particular eating metals and rubber. Basically a goo, microbial mat, that covers everything that has water and sulphur or organic or metals. Probably thats how the life began, and it will end in a similar way.