+1
it's nowhere close to a standard to split lanes. It is just a plate of
spaghetti. hard to edit and maintain for no good reason. If it where anywhere
where I care I'd just revert that.
On Jan 23, 2012, at 8:20 PM, Nathan Edgars II wrote:
On 1/23/2012 9:52 PM, dies38...@mypacks.net wrote:
Over the past couple of months, I have armchair-mapped several highway
junctions in the United States which are commonly complex in that they
involve multiple turn restrictions, street name changes and pedestrian
crossing placements.
I would like to have some critique from someone experienced in mapping such
junctions so that I ensure I am following current best practice and am not
just creating a bunch of plates of unpalatable spaghetti.
Two recent junctions are found in the following permalink views
* http://www.openstreetmap.org/?lat=40.095879lon=-75.296179zoom=18layers=M
* http://www.openstreetmap.org/?lat=39.128273lon=-77.237731zoom=18layers=M
Yuck. A separate way should not be used for a turn lane (unless that lane is
separated by barriers or maybe a wide striped-off area).
Corollary: a separated right-turn lane begins and ends approximately where
the traffic island begins and ends, not where the separate lane begins and
ends.
Turn restrictions are not for identifying which lane goes where. They are for
restrictions on turning (e.g. if no left turn is allowed, you use a
no_left_turn restriction). Thus neither example needs any restrictions, since
you can turn in any direction from any approach. (Some mappers like to use
what are, frankly, completely redundant restrictions that force you to do
what any router will have you do anyway, such as no right turn at the
intersection if there's an island-separated right turn lane.)
The second one is a simple crossing of two divided roads, found all over the
place (e.g.
http://www.openstreetmap.org/?lat=28.38582lon=-81.506134zoom=18layers=M -
note if you check against the aerial that the west-to-south right turn has
recently received an island).
Of course the above is just my opinion, strongly influenced by what I have
seen as standard practice all over the country.
___
Talk-us mailing list
Talk-us@openstreetmap.org
http://lists.openstreetmap.org/listinfo/talk-us
___
Talk-us mailing list
Talk-us@openstreetmap.org
http://lists.openstreetmap.org/listinfo/talk-us
