I've wondered for a while now - is there any research on map routing algorithms that allow for significantly longer routes, which meet other criteria like "more peaceful" or "simpler" or "less pollution"?

The excellent #CycleStreets app (based on #OpenStreetMap data) allows for quiet/balanced/fast routes, but "quiet" isn't quite what I want.

For example part of my route from work to Euston could go via the canal around Regent's Park, but that option is never suggested as it is 10min longer: