I generally use RWGPS for initial route selection on my group tours, but try to verify everything in person - for a number of reasons. I've gotten quite good at detecting surface type - here are some tips.


It helps a lot to turn Labels OFF, as the labels include a Google whitish line over every road that tends to obscure the surface. You'll find this in the map selection box (top right corner) in RWGPS.


Often that will allow you to see if there are any white lines or not, either edges and/or center, which is a reliable indicator.


Otherwise, you'll need to really zoom in, and try comparing the road surface at intersections, or driveways. In rural areas, many driveways will be unpaved, so look for variations in color between known paved roads and questionable ones. Also be careful of roads that may start out as paved, but change at some distance from a paved main road.


Good luck