Not sure where to post this but since an application (local or web based) could be an answer I post it here.
Use case: When I am not in a hurry when I am going somewhere by car (that is, most of the time) I avoid the highways and drive on smaller roads where you pass by, and can stop and visit castles, churches, views, local markets and similar.
My problem is that Google Maps and similar don't really have a way to give directions that suit this type of driving. I can deselect motorways but quite frequently that means that the suggested route it 50% longer and takes twice the time, just because somewhere along the road there is a motorway bridge over a river and avoiding that bridge means a 2h detour.
I want instructions that makes a sensible compromise between time and non-motorway. That is, if I save one hour by driving ten minutes on the motorway I want to do that. However if it takes 45 minutes to drive between A and B on non-motorway and 40 minutes on motorway I want to avoid the motorway.
Ideally, I would like a map application that suggest two sets of directions, "100% focus on saving time" and "100% non-motorway", respectively. Then there should a "lever" that I can drag between these two extremes that, if I start at the non-motorway side, "cherry picks" the motorway parts of the trip that saves most time. In other words, if I go to 98% it should suggest a route that takes motorway for 10 minutes so I take the bridge over the river mentioned above and save 2 hours. Next step might be 10 minutes on the motorway around a city rather than driving through it that saves 50 minutes. And so on.
Does something that offers this exist? Or can I somehow do it manually (one problem with Google Maps is that if I plan a route from A to B and then to C I can't set it to allow motorways between A and B but avoid them between B and C) without "too much effort"?