I think "no_left_turn" is the best solution. The line on the middle of the street is not a u-turn indicator, it is an overtake indicator which can be tagged with overtaking=no and overtaking=both.
Are you sure that the dotted overtake line allows you to make a u-turn? Janko 2012/7/3 Pieren <[email protected]> > Hi all, > > Someone on the help site is questioning about a missing u-turn > restriction on a roundabout junction with splitter islands ([1] in > French). The problem is when you take one roundabout exit and want to > come back to the roundabout, a router like OSRM is telling you to > immediatly turn left after the divider although it is not allowed on > the ground. > He is pointing one example on OSRM : > > http://map.project-osrm.org/?hl=fr&loc=47.291040,-2.356550&loc=47.291970,-2.356720&z=18¢er=47.291347,-2.357208&df=0 > > With the aearial imagery (can be enabled on OSRM), we can see that the > u-turn is forbiden on about 10..15 meters after the splitter island > with a painted continuous line on the ground. I don't think a > no-turn-left-restriction relation is the best solution here since we > just indicate the restriction at the splitter island node but we don't > say at which point it will be possible to u-turn. I think the best > solution is to represent the continuous painted line on the 15 meters > road segment. The best tag I've found so far is the "divider" proposal > on the wiki ([2]) but is not very popular ([3]). Any thought ? > > Pieren > > [1] > http://help.openstreetmap.org/questions/13939/interdiction-de-tourner-sur-entreesortie-de-rond-point > [2] http://wiki.openstreetmap.org/wiki/Proposed_features/Divided_road > [3] http://taginfo.openstreetmap.org/keys/divider > > _______________________________________________ > Tagging mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/tagging >
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