On 16/09/2020 20.40, Taskar Center wrote:
crossing has been a very poor tag because it seems to be the kitchen
sink for all the questions pertaining to crossings... Many of the
attributes that get values in "crossing" are potentially overlapping
and not mutually exclusive, causing a lot of confusion and poorly
tagged crossings. Nevertheless, specifying crossings is very
important because it's a highly contested street region.
The crossing tag has held many values that may overlap, and we should
once and for all split out all these different tags so we can be
mapping what we mean and mean what we map. Questions we should be
answering when mapping a crossing: 1) How is this shared space
controlled? A crossing is a high risk environment where traversal is
shared between cars and pedestrians (they are of unequal footing). So
the type of 'control' and 'right of way' in that space is important
to specify. 'uncontrolled' is a very bad tag in this direction
because it has an actual legal, non-intuitive meaning and many
mappers mistakenly think a crossing that has no traffic signal is
uncontrolled- so that's a really bad tag. crossing_control= ?
It's also atrocious because it can *only* be verified by survey. As much
as we prefer surveys, the reality is that a lot of mapping happens just
from aerials, where crossings (both marked and, in some cases, unmarked)
can be seen, but signals cannot. As someone who's generated a fair
number of "uncontrolled" crossings because that was the only "blessed"
tag, I would much prefer separating the presence or absence of features
that can be verified in an aerial (marked, unmarked, striped, island,
...) from whether or not signals are present.
3) How can a pedestrian call up the signal and how can they sense
whose right of way is currently allowed? Is there a call button? Does
it chirp, speak out, vibrate?
Id' be careful with this one; I've read that those buttons are often
placebos. I suppose if we're just mapping whether a button is present or
not, that's okay, but just because there *is* a button doesn't
necessarily mean it has to be pressed.
--
Matthew
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