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[mkgmap-dev] don't route through highway=construction

From Greg Troxel gdt at ir.bbn.com on Wed Oct 14 00:22:06 BST 2015

Richard Welty <rwelty at averillpark.net> writes:

> On 10/13/15 10:34 AM, Greg Troxel wrote:
>> I agree that 'highway=construction' should be omitted from routing.
>> That to me indicates "they are building a road but it is not usable".
>> If the default style routes over that, it's just a bug and should be
>> fixed.

> last time i looked highway=construction didn't imply access at all,
> leaving it to the mapper to set access= appropriately.

It doesn't explicitly, but there's a strong implication that
highway=construction is for unusable roads - because construction=minor
is for usable roads with construction activity.  Quoting:

  For minor road-works (where the road in question remains open), use
  construction=minor (and don't use highway=construction, but leave it at
  its default value).

> this makes sense, because sometimes construction is impassible and
> sometimes it's not.

repairs and resurfacing etc. are generally passable and that's what
construction=minoris for.  A new road that has been proposed and is now
being built is essentially never passable.  Or once it is, it's time to
retag it has highway=secondary or whatever and add construction=minor.

> unfortunately, the wiki doesn't really explain this and what mappers
> and data consumers are actually doing seems variable and inconsistent.

True, it's a mess like all things wiki :-)

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