On Fri, May 12, 2017 at 12:57 AM, Marc Gemis <marc.ge...@gmail.com> wrote:
> So would a stop sign / give way sign /traffic signal then be mapped as > > stop_position: node where on the street does one have to stop/give > way/wait for traffic signal > My thinking on this is stop_position isn't necessary as, unlike public transportation, the distinction from the conflict point itself (the intersection node(s)) isn't significant enough to bother. > sign : node (optional) the exact location of the sign > I'd go with device instead, as this could potentially be a traffic signal. Or on many intersections where a high traffic expressway crosses a minor road, it could be multiple devices: Traffic signals that is perpetually flashing red for the minor way and flashing yellow for the trunk, in addition to stop signs facing the minor directions. This comes up a lot, for example, on US 26 between Gresham and Government Camp, US 30 between Portland and Warrenton, and pretty much any 70 MPH surface expressway in Oklahoma. > from: the way one is following to which the action has to be applied > (is this needed ?) > Yes, but optional. There could be multiple from ways. For example, a four way intersection for which there is a three-way stop, and one of those directions may turn right without stopping. Or a French example, a traffic signal that has a "bicycles yield when turning right <https://upload.wikimedia.org/wikipedia/commons/thumb/c/c4/Panneau_tourne_%C3%A0_droite.jpg/800px-Panneau_tourne_%C3%A0_droite.jpg>" sign. > intersection: the node of the intersection for which the sign/signal holds > Yes. to: the collection of ways one can travel to after stopping/giving > way/waiting for traffic signal. This would include the from way so > u-turns have to obey the sign/signal as well. > Yes. At a minimum, a stop, give_way, traffic_signals or traffic_calming relation would have 1 from, 1 intersection and 1 to. > is this how you see the relation ? Could it be simplified for the most > common case that the sign/traffic signal applies to all directions one > can travel ? > Yes. A situation like an onramp meter <https://en.wikipedia.org/wiki/Ramp_meter>, onramp or similar yield sign, or all-way stop where all possible movements for which the control or calming applies is a single node, and all movements across that node are affected by the calming or control, could still be mapped as just a simple node with the current schema. > what in case there is a turn restriction at the intersection ? Does > the to-collection of the stop sign also have to include prohibited > turns ? > No, you would use the existing turn restriction relation schema for turn restrictions.
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