Having trouble figuring out the best way to map a difficult intersection. I have seen it done in differently, in the map. The highway and junction wiki pages offer no suggestions.

Imagine a road coming to a T-intersection, but each turning direction bears off, so it forms a Y-intersection (with the intersecting road still at the top of the Y), such that there is a impassible triangle between the three roads. Each road has traffic in both directions.

One way that I have seen this done is calling each branch the name of the original street.

Another way that I have seen it is designating one branch a highway=service and leaving it unnamed.

Yet another way is tagging one branch as a "highway link" and leaving it unnamed.

Generally, there are no housenumbers on either branch of the intersection, so it would not really matter for numbering, but my sense is a road name should be used for one road, whenever possible. I would like to know how best to handle this for routing.

  1. service road
  2. duplicated road
  3. service road
  4. service road
  5. duplicated road

edit: as requested, above are links to the different methods mentioned. did not see any link roads, to show here, although they are rare the description does read like the best option.

asked 07 Sep '16, 02:14

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mtc
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edited 07 Sep '16, 15:13

1

Can you post a link to the area in question ?

(07 Sep '16, 09:31) Vincent de P... ♦

2 and 5 are the correct way to do it - i.e. a way with the same name and highway type. There is no rule in OSM that "a road name should be used in one road wherever possible".

_link tags are used for roads with slip-road characteristics, and could potentially be used in such circumstances but in practice are used for more complex intersections.

A service road has its own access implications so would be incorrect in these circumstances.

permanent link

answered 07 Sep '16, 15:57

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Richard ♦
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accept rate: 19%

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question asked: 07 Sep '16, 02:14

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last updated: 07 Sep '16, 16:14

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