I have never mapped any myself. Mostly, AFAIK, ice roads are used by large vehicles on the North Slope of Alaska where they haul supplies to the oil fields or out to wellheads in the Arctic Ocean. There are only three in Alaska, two are service roads, one uses the ice_road=yes tag, the other surface=ice while the last is actually a ferry route on a frozen river. That one was tagged with ice_road=yes and surface=ice_road. I changed the surface tag to surface=ice and left the other tags as is but I don't think tagging a ferry route as an ice_road is correct. As for tagging, I would consider them unpaved at the minimum because IMO drivers of ordinary vehicles would generally want to avoid them. In the case of the oil field service roads, those are most likely restricted (acess=private) anyway so shouldn't be used in a routing scenario. Your ice_road rule looks good to me and sidesteps the question of setting them to unpaved nicely. I found your full surface rule and inserted it into my lines style sheet instead of the one I had been using. Thank you. On Tue, Feb 7, 2017 at 4:08 PM, lig fietser <ligfietser@hotmail.com> wrote:
Talking about surface=ice, how do we handle ice_road=yes? Those roads are common in the Arctic regions and cross frozen lakes, so only accessible in winter. See http://overpass-turbo.eu/s/ls3
In the generic new style map I made those roads unroutable. https://github.com/ligfietser/mkgmap-style-sheets/blob/ master/styles/generic%20new/lines highway=* & ice_road=yes { addlabel 'ice road' } [0x10002 resolution 24]
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