Am 24.04.2009 07:19, Paul Johnson: > In Salem, Oregon, I have encountered a ramp that I can't quite seem to > make a restriction that JOSM thinks is valid, so I'm wondering what the > expected way to handle such a situation is. The area in question is > visible at > http://www.openstreetmap.org/?lat=44.929397&lon=-123.024784&zoom=18&layers=B000FTF > > Coming from the flyover ramp to Mission Street eastbound, as well as > from the Mission Street bike lane ramp where that lane rejoins the road, > drivers and cyclists alike are faced with a No Lane Change line that > prevents a legal movement to the left turn lanes onto 17th Street. > Effectively, this means that you may or may not be able to turn left at > 17th depending on how you entered from the next intersections west. You > can see the pavement markings as they are on the ground at > http://maps.google.com/?ie=UTF8&ll=44.92934,-123.02527&spn=0.000872,0.002414&t=k&z=19 > > For those who aren't familiar with why this is a hard question: > > 1) JOSM doesn't seem to want to have more than one "via" or have a way > as a "via" in a restriction relation; I'm not sure if this is right or > wrong for JOSM to expect. What's the live use on this? > > 2) Solid white lane lines mean you can't change lanes in this area > (exception being bicycles are allowed to enter or leave their restricted > lane over the solid line adjacent to the bicycle restricted lane). > > 3) Only one lane change is allowed per vehicle per 1000 feet. Lane > changes are unrestricted between all lanes for 60 feet between the two > intersections, and traffic moves at expressway speeds (40-50MPH). > > So how does one handle such awkward turn restrictions (other than > slaughtering the civil engineer who came up with such a bogus > interchange to begin with)?
That's a real tough one, but I think it cannot be resolved with current restrictions alone. It would need some to-be-made-up lane restrictions. [1] includes some first thoughts about lanes, while [2] already talks about lane-specific restrictions. Claudius [1] http://wiki.openstreetmap.org/wiki/Relations/Proposed/Lane [2] http://wiki.openstreetmap.org/wiki/Proposed_features/lane_and_lane_group _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
