Ayesha wrote:My suspicion is OSM classify perfectly rideable A roads as ‘Highways’ and the Garmin detours round them.
Anyway, I’m not shelling out until I’ve witnessed a Garmin Bicycle GPS plot a route as good as a TomTom Rider. That may be never.
Well they may be with the Navteq mapsets which Garmin sell. You are correct that OSM compilers have differing classifications for 'Highways'. Velomap for example would behave the opposite of what you would like if Car was selected. It would give a bicycle leisure route.