Okay, I'm still pondering how to tag this intersection properly. The road network data has been imported from GeoBase, but I feel that the ways depicting the intersection are not accurate.
The main N/S roadway is a dual carriageway, two lanes each, with decelleration/accelleration lanes added on the right on either side of the intersection. There is also a left turn lane added, making the roadway 4 lanes wide at the intersection. The right hand lanes have islands, so they should get a separate way around the corner in my mind. The left hand turn lanes are not separate so I would choose to not show them as a different way. The E/W roadways have decorative planters separating the ways as they approach the intersection, with a single lane each way. However through traffic is not allowed straight across the intersection. This restriction is enforced by concrete islands that direct traffic flow. The GeoBase depiction shows the N/S left turn lanes as separate ways. The forced left turn lanes on the E/W roadway are depicted as well, but these 4 turn lanes share 4 common nodes, creating a diamond in the middle of the intersection. Would a routing engine possibly mistake these common nodes as a valid routing choice, and try to get people to follow the routing in an obviously incorrect manner? Should these ways cross each other without common nodes? By not having a common node, there would be no way for a routing engine to make a mistake. These ways do indeed all cross at the exact same physical level on the pavement, with no grade separation, but it is not legal to change from one way to another at that point. Here's the current OSM depiction. http://www.openstreetmap.org/?lat=53.53393&lon=-113.26316&zoom=20 Here's a satellite view from Google just for visualization. http://tinyurl.com/yjmo6o2 Here's a Google Streetview of the intersection. http://tinyurl.com/y9b7qa2 (gotta love Streetview! Just got it for our area within the last week, hence the redux) BTW, GoogleMaps doesn't show the turn restrictions either... I want OSM to show it properly. James VE6SRV _______________________________________________ newbies mailing list [email protected] http://lists.openstreetmap.org/listinfo/newbies
