the wet road reflections are doing something clever and it is not what people think
everyone is saying ray tracing. maybe. but the thing that actually makes it read is that the reflections are broken up correctly. wet asphalt is not a mirror, it is a thousand small puddles between raised aggregate
the reflection breaks along the texture of the road surface rather than smearing. that is a material problem not a lighting one and it is the reason it looks like a road and not like a floor