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Cycle.travel and cyclestreets.net both do this to some extent. The trouble is that the data on the road surfaces needs to exist in some database. Generally works in well populated areas but in middle-of-nowhere Eastern Europe the data either doesn't exist or goes out of date as roads are resurfaced/left to decay.
Colonel_of_Truth
Someone should write an openstreetmap thing to which you can upload a route and have it warn you about bits that are surface=unpaved or bicycle=no or roadisinshite=yes