I encountered both cases and can't seem to find the rule. Some 2 way-streets that are separated by a continuous white line are represented bu only one segment and sometimes by 2 segments. asked 20 Jun '16, 15:46  sdbensa |
2 Answers:
Generally - for streets - we map 2 parallel ways when there is some kind of physical barrier, and one way only when the divider is simply a line. The boundary is blurry though. I suggest that you choose which form of mapping works best for you and apply that, without attempting to change the work of others to fit your personal style. answered 20 Jun '16, 15:54  Frederik Ramm ♦ |
In most cases, a barrier will help determine whether to use 1 or 2 ways. Another test is whether navigation directions for a left turn from a driveway would result in a misleading route such as "turn right, then make a U turn at the next intersection". answered 21 Jun '16, 10:58  Mike N |
Can you give examples of both? It'd be easier to know what you mean by "2 segments" then.
@SomeoneElse: See this: https://www.openstreetmap.org/way/294623880 - one way for a two-lane, two-way street. The westernmost node is connected to two ways, 1 lane each, 1 direction each - yet there is no significant change in actual, on-the-ground street properties. https://www.openstreetmap.org/way/25920361 https://www.openstreetmap.org/way/4064054
That way's a good example of why I was asking - there are two parallel segments to the west, and at the east end https://www.openstreetmap.org/node/2982164520 splits 2 sections of Bucharova with different tags (in this case a different number of lanes).
The east end is different for lane tags - I'm not disputing that. But the west part could be IMHO mapped as a single, two-lane way, with the same meaning as the current two one-ways have (couldn't be merged with the longer one, as there are different relations on both).