I've got a Garmin Edge 810. Sometimes when using routes created with Garmin Connect or Strava Route Builder, I unfortunately find myself on bad gravel roads.
Is there a route planning tool that allows you to only select asphalt/tarmac?
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Use Bike Route Toaster and make sure you are using Open Street Maps Cycling version ("Open Cycle Map). As part of the route finding options under Open Street Maps there is an "Avoid unpaved roads/paths"
I have successfully used Bike Route Toaster with a Garmin 800 in the past. I planned out a 1000 km journey across Norway on back roads, gravel (eek!) and paths. It was amazing how well it worked, thanks to the all the hard effort of volunteers around the world who contribute to the cycling version of open street maps. I only had one minor hiccup in all those miles.
I am planning to bike across Pennsylvania this summer and I am having trouble finding good roads to use for biking. Then I hit upon the idea of Google street view (and the Microsoft version of it). Using street view has been a fantastic help for me! I have found a route that has paved shoulders for my entire north/south route! And that was in a couple hours. My plan is to spend more time looking for alternate routes over the next week or two.
I tend to find that in the UK at least, a quick check if the road has been 'Google StreetViewed' will show if it is tarmac or not. You can quickly check this by dragging the 'pegman' (little orange StreetView icon located above the zoom bar), if the road has been StreetViewed then it will turn blue.
In my experience over 90% of coloured roads on OS Maps (i.e. not white) are paved, these can be seen on http://maps.bing.com.