I am working on a project using city road data. The data has every road in the city visualized as lines and with directional data stored in the attribute table (one-way to-from, one-way from-to, and all). I'm wondering if there is a way to split the two-way lines into two separate one-way lines offset from one another but ending in the same point. Any help would be tremendously appreciated!

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Thank you!

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    What GIS software and version are you using to try and do this? – PolyGeo May 23 '13 at 21:37
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    Sorry, I should have included more info. I'm using ArcGIS 10.1 and the reason for splitting them is simply to model two way attributes of single-lined roads. The goal is to make a network of my city's streets so that each direction of every road has its own unique ID and attributes. As of now, only some of the two way roads are split. I work for a transportation research organization, if that helps at all. – GISNetworkHelp May 23 '13 at 21:50
  • I'm guessing that you want them parallel for most of their length and that they join at the ends but what happens near the ends? Perhaps you can include a diagram. – PolyGeo May 23 '13 at 21:56
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    Yes I'd like them to be parallel with vertices near either end which connect them to the endpoint. Here's an image showing what I'd like for each road (sorry if this is not the right way to show images, this is my first time using this site!): i.imgur.com/3ffuRIs.png – GISNetworkHelp May 23 '13 at 22:01
  • It's ArcPy code that I could write but do not have time to at the moment. I'll upvote your question because with more reputation you can do more things on this site. If you can, try to include your image (you may not yet have enough rep) and the additional details we've discussed into your origial question that you can revise using the edit button beneath it. – PolyGeo May 23 '13 at 22:08

Edges can contain routing direction for each edge, so no need to bifurcate. The reason for bifurcations that look like your topology, commonly used in routing software, are to encompass the presence of interior physical restrictions such as barrier with the median of in dual carriageways.. The routing aspect can be handled by interior and exterior turn restriction causing code running on the object model to represent the path of traffic at intersection segment features.

  • How do I assign routing data to each edge? – GISNetworkHelp May 24 '13 at 14:32
  • By not adding any restriction travel could be assumed to be to be both ways, adding a restriction to either side you would be preventing travel in the from and to direction in the order the restriction is applied in relation to junctions of the segment. How would depend on the rule based object oriented topology editing you have available for your GIS and what routing application your intending on running on your product. – lewis May 26 '13 at 1:07

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