On Fri, Oct 13, 2017 at 6:49 PM, Kevin Kenny <[email protected]> wrote:
> On Fri, Oct 13, 2017 at 7:30 PM, Greg Troxel <[email protected]> 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. > No argument here; I consider trunks and motorways as a special case of primary. > (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. > I generally consider state highways as secondary unless they're quite large or hit trunk or motorway. > (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. > We don't even need to tag for this, as it can be inferred from the GPX database instead.
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