Alan Mintz <[email protected]> writes: > At 2012-09-15 16:05, Greg Troxel wrote: > >>Charlotte Wolter <[email protected]> writes: >> >> > I'm working on US 50 near Trenton, Ill. Here's the location: >> > http://www.openstreetmap.org/edit?lat=38.61248&lon=-89.68529&zoom=16 >> > It looks like, at one point there were plans to turn this into >> > a motorway. In two spots in a 25-mile stretch, intersections have been >> > turned into cloverleafs and the highway divided. In other locations, >> > roads that used to intersect US 50 have been turned into >> > overpasses. There are even a couple of bridges for a second lane but >> > no evidence of any construction work actually to build that lane. The >> > vast majority of the highway is still two-lane blacktop. >> > So how does one tag this, as a primary road that just has a >> > couple of cloverleafs? >> >>My take is: >> >> motorway: truly meets interstate specs for extended periods - multi >> lane, no at-grade intersections. I would not tag something as >> motorway when it's only sometimes motorway unless it's ~10 miles long. > > US101 near Ventura, CA, goes back and forth among > freeway/primary/trunk over relatively short stretches. There are, > however, "Begin Freeway" and "End Freeway" signs that tell you exactly > which sections are motorway. This might be a DOT requirement.
That sounds like a perfect example of the most difficult case. > SR-1 south of Oxnard is similar. Here's the location of such a sign > going northbound: 34.112471°, -119.081681° Where I'm coming from is that if a stretch of road that is 1 mile long is separated and has no at-grade intersections, that doesn't make it feel like a motorway/interstate, because part of the essence of interstate is that one can drive for extended periods with the expectation of not encountering an at-grade intersection. So the question of whether a 1-mile section of road meets specs is different From whether that 1-mile section is part of a motorway. Clearly one shouldn't tag sections as motorway up to intersections and then make the intersections trunk. So a motorway really needs at least some grade-separated interchanges. There's an alternative view, which is to follow begin/end freeway (not a federal thing; I don't see those in Massachusetts) for whatever lengths, and adjust the renderer to demote to trunk if they are short. But I see the motorway tag as representing the cartographer's judgement as what should be shown to the user as being a motorway, and as a road user I don't think a mile or two section can *be* a motorway, even if that section meets specs.
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