+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, [email protected] 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=40.095879&lon=-75.296179&zoom=18&layers=M >> * http://www.openstreetmap.org/?lat=39.128273&lon=-77.237731&zoom=18&layers=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=28.38582&lon=-81.506134&zoom=18&layers=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 > [email protected] > http://lists.openstreetmap.org/listinfo/talk-us _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
