Hello, I'm a mapper in OpenStreetMap. We have a user that uses mkgmap with Garmin devices and he's setting road class inside cities lower than the local convention to get Garmin to avoid being routed through slow roads, which is bad practice. [4] I'd like to ask for some advice on how to help him set mkgmap to avoid such problems without disrespecting community guidelines. I've downloaded the source code [1] and read through the default styles in ./trunk/resources/styles/default/ . If I understood correctly, it sets road_speed=3 (60km/h [2]) for highway=secondary and road_speed=2 (40km/h [2]) for highway=tertiary. Those are reasonable in rural areas, but too fast in urban areas, where average speeds usually drop by around half of their real speed limit.I also found rules for handling the speed limit in maxspeed=*, but it seems like his issue would persist even when this tag is provided in map data. I think it might make sense to write a custom style [3] setting road_speed=2 for highway=secondary and road_speed=1 (20km/h [2]) for highway=tertiary. Perhaps this would then break some rural routes. I've found that Garmin supports traffic data, [5] but I'm unsure if this works with maps converted using mkgmap, as I don't own any Garmin device. Do you know? Thanks in advance for any information and advice. Best regards, [1] https://www.mkgmap.org.uk/mkgmap [2] https://www.mkgmap.org.uk/doc/pdf/style-manual.pdf [3] https://wiki.openstreetmap.org/wiki/Mkgmap/help/Custom_styles#Writing_a_styl... [4] https://wiki.openstreetmap.org/wiki/Tagging_for_the_renderer#General_meaning [5] https://www8.garmin.com/traffic/index.html -- Fernando Trebien