VeloMap's routable OSM bike map of Portugal
This map of Portugal is based on data from the OpenStreetMap Project. The map is similar to the openmtb map but it focuses less on offroad trails but more on roadcycling and touring. It is routable giving preference to small streets and bike routes. A lot of bike relevant information is shown such as bridges, tunnels, bike lanes, one way streets etc. The maps are updated quite frequently (up to three times a week).
OpenStreetMap works that way, that everybody can upload their GPS tracks from which maps from all over the world are being created. This means that the quality of the map depends on the tracks uploaded by the users (you're welcome to contribute to the project by uploading your tracks as well) and therefore the quality differs greatly from country to country, region to region and city to city. As there are continuously new tracks being contributed the maps are getting better and better every day, so if a map of a region is not as detailed as you had expected either join the community and help by contributing and/or come back in a few weeks or months and you will most likely find a better map with more data and information than there was before.