On Fri, Oct 13, 2017 at 7:30 PM, Greg Troxel <g...@lexort.com> wrote: > I don't think "important connecting role in the long distance road > network" should have anything to do with it. A regular US highway that > is not divided, grade-separated, mostly limited access is still a key > interconnecting road, and it's squarely "primary". Most of US 20 is > like this, as I understand it, and all or almost all of the parts I've > driven on (MA, WY) are like that.
You're saying basically the same thing I've been saying. But... people who do routing and make maps are asking for three things, and we separate them only incompletely. (1) How "important" is this road to the long distance road network? If you look at a small-scale map of the state of Maine, you'll virtually always see US 1, 1A 2, 201; Maine 6, 11, 16, 161, 205. Maine has only the one Interstate (95) plus a loop (295 from Portland to Augusta) and a spur (395 into Bangor). This is what guides the decision to render a road at a given scale. (2) What are the road's physical characteristics (access control, grade separation, number of lanes, width of shoulders, presence or absence of traffic lights and stop signs)? This is what guides the symbology to use. While Maine 205 is an important road in its area, it is NOT rendered as a freeway, or even a trunk. It's at best a primary and may even be a secondary, and that's how is should be rendered even on a small scale map. (3) How fast does traffic ordinarily flow on the road? This is what (should) guide the routing decision; routing is ordinarily done to save the driver's time. It is of key importance to navigation systems, but doesn't ordinarily guide rendering. In places with sensibly-designed road networks, these three concerns are strongly correlated, and a road that scores high on any axis is likely to score high on the other two. But this is the US. Using the standing of a road on any of these three axes as a surrogate for the other two is doomed to a suboptimal result. _______________________________________________ Talk-us mailing list Talk-us@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-us