> Just to clear the cobwebs in my mind, could some one please give
> opinion on the following statements:
> A- The length of Attributes `Beginning, Middle, End' is not defined.
> Apparently, they look useless.
Any length of road feature complies with this. Point from where you start
drawing is Begging (marker A) and rest is respectively.
> B- But their only use is to create intersection point/s with the
> `Surface' road/s and that defines their specific location. This is an
> artificial intersection only because the Underpass has not physical
> link with the `Surface' Road.
When choosing Underpass/Overpass from category list then it avoids making
intersection with adjacent roads and that is the main purpose of creating
the underpasses and overpasses. Since traffic cant jump from an overpass to
its crossing road so then if there is an intersection that will make
directions turn unless turn restrictions are edited.
> C- Unless there is some other specific reason, wouldn't it be more
> simpler to keep the `Underpass' simply as an `Underpass' without any
> such attribute. And when the `Underpass' comes out in the open, make
> it `Surface'.
I couldn't understand this!
> D- The only advantage that I can see is that these Intersections
> provide more geographical information. Is that correct?
Intersections gives more flexibility in directions rather than just
geographical information. A crossing can also be marked as traffic circle
anyway.
Regards,
جabran
www.dyzynz.net
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