It would be great, if there was automatic road surface detection.
surface=asphalt for the roads and surface=sett for the crossing would be detected.
That would really help in those urban areas, but of course other surfaces (see https://wiki.openstreetmap.org/wiki/Key:surface ) are interesting as well.
As this is task would mainly consist of recognizing texture, neural networks should be well suited.
Ideally, as an output, the JOSM plugin would project the features onto roads and support automatically segmenting those… but anyway, a simple display would also be really helpful.