On Tue, Apr 6, 2010 at 8:54 AM, Xan <[email protected]> wrote:
> Or where the light signal, isn't? > > So, I have to fix some traffic:signals: > http://www.openstreetmap.org/?lat=39.551131&lon=2.620521&zoom=18&layers=B000FTF That looks like a problem area that is under discussion... http://wiki.openstreetmap.org/wiki/Proposed_features/Set_of_Traffic_Signals At a simple intersection, when two single ways intersect, a single node defines the intersecting point, and that should be tagged with the traffic signal. Even though there may be 4 poles holding the actual light hardware, the traffic signals control that single intersecting point. Think of it from a routing engine perspective. The computer is basically running it's digital finger (ha, I made a funny) along the line that defines the road. When it gets to the intersection, it notices that there is a traffic signal associated, and might make a note of that (taking into account that the light may impede progress, or maybe tell the user to "Turn right at the traffic signal"). However, if the routing engine is running it's finger along the way, it's not going to be looking for things tagged along the side of the road. If the traffic lights are tagged as independent nodes beside the way, how do you know that the independent node is associated with the way? In the same light, there are bus stops tagged along the side of Rotherham Road. The bus shelter/bench is physically located at that location, but one would think that the bus stop node would be associated with a bus route, rather than an independent node beside the roadway. These are little issues that make making a map so much fun! James VE6SRV _______________________________________________ newbies mailing list [email protected] http://lists.openstreetmap.org/listinfo/newbies
