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# Why are streets split into several ways?

 3 Why are streets often split into several ways on OSM? examples: "campus drive, stanford" "kirchengasse, vienna" "the bowery, nyc" asked 05 May '14, 20:13 snupo 96●6●6●11 accept rate: 0% aseerel4c26 ♦ 32.6k●18●248●554

 12 Streets are split when one or more properties are different along the street. A non-exhaustive list of such properties would include: Speed Limits Number of Lanes Parking restrictions Nature of street lighting Bus routes along the street One way sections No left/right turn restrictions which require a via point Changes of jurisdiction (where say, house numbering restarts) Change of surface: asphalt to concrete, asphalt to dirt, etc. Nature of the source data (some part may have been seen by a mapper, the rest completed from imagery) Presence or absence of sidewalks etc Streets are naturally represented as several ways if they are not linear, or if they are dual carriageways. If a street is split it is best NOT to recombine sections unless using JOSM which forces a check on all mismatched tags. Creating multilinestring topologies representing all parts of a named street should be done outside OSM as a processing step on an extract. For most streets this is trivial, but there are a number of well-understood exceptions which can create problems and for which there are no good widely available solutions. answered 05 May '14, 21:46 SK53 ♦ 28.1k●48●268●433 accept rate: 22%
 3 Ways are split when the attributes/tags change (and when relation membership changes too). A random example: the speed limit changes, you slplt the way and apply the new speed limit. This does lead to sometimes very small segements (joke for old hands), but is perfectly OK. answered 05 May '14, 21:44 SimonPoole ♦ 44.7k●13●326●701 accept rate: 18%
 -2 Are they Dual-Carrage ways; with a barrier between the two one way parts? They can be split to help routeing especially when only one half of the road links to a paticular side road. answered 05 May '14, 20:30 Govanus 154●3●7●11 accept rate: 3% How does splitting a road help the router? (06 May '14, 07:31) scai ♦ 4 I think they're referring to the separately-mapped oneway parts as opposed to a single way representing the entire dual-carriageway, but that has nothing to do with the original question. (06 May '14, 18:39) alester the router can more easily handle when traffic can't cross between the carrageways at junctions (01 Mar '16, 19:11) Govanus

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question asked: 05 May '14, 20:13

question was seen: 4,438 times

last updated: 01 Mar '16, 19:11

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