Support multiparameters - Avoid motorways + "prefer unpaved roads" about osmand

[yuriiurshuliak]

It appears that the "prefer unpaved roads" setting may not be accurately influencing route calculations when combined with "avoid motorways." In this case, the "prefer unpaved roads" option is not affecting calculations for unpaved roads, but rather for motorways. Most likely, this is expected behavior and as the route you indicated is quite difficult to calculate only on unpaved roads. The "prefer unpaved roads" option doesn't completely exclude unpaved roads from consideration but rather lowers their priority. You can find the web version of the map here.

[sinkoneri]

The map you linked doesn't contain any unpaved roads so if "avoid motorways" enabled, and can't calculate the route with unpaved tracks the prefered route should be this via route 7, which avoids M7 motorway.
I think the fallback route should check the avoid filters but now it ignores.

[vshcherb]

Tha's not an issue of routing engine but issue of routing configuration - https://test.osmand.net/map/?start=47.497380,19.037180&end=47.229784,18.650196&profile=car&params=car,avoid_motorway,prefer_unpaved,noglobalfile,hhoff#14/47.2507/18.6793

If both roads are paved, obviously that should have same cost and as we have penalty for avoiding motorways it should be lower. The issue that we can't use 2 params for speed but we probably can lower priority for both cases.

[xmd5a2]

I've made some corrections. Routes are calculated as expected but surface for motorway is not considered. It can be an issue in places like Alaska, Siberia where motorways have bad surface. At that moment I don't see how this can be improved without routing engine enhancement. New maps are not required.

motorcycle, avoid_motorway, prefer_unpaved

Case 1	Case 2

[vshcherb]

We need if=motorcycle, avoid_motorway, prefer_unpaved

[sinkoneri]

I've made some corrections. Routes are calculated as expected but surface for motorway is not considered. It can be an issue in places like Alaska, Siberia where motorways have bad surface. At that moment I don't see how this can be improved without routing engine enhancement. New maps are not required.

This routes looks good although I don't understand what do you mean by surface for motorway is not considered? Yes, b'cos it is set to avoid them. And if it is set to avoid motorways why could be a bad surface a problem? (The route doesn't even go via motorways. (Although with a motorcycle it shouldn't be a big problem at least with an adventure motorocycle with off-road capabilities)

[vshcherb]

We don't support proper multiparameter choice so our routing works fine with 1 selected parameter but with 2+ it doesn't find the right balance for penalties