[OSM-talk] Re: One way streets

Andy Robinson Andy_J_Robinson at blueyonder.co.uk
Wed May 17 08:47:35 BST 2006


The Destinator software on my PDA says "At the roundabout, third exit, 500m"
etc. So it knows the feature is a roundabout. So a way that closes itself
merely needs a "loop" key?

Andy Robinson
Andy_J_Robinson at blueyonder.co.uk 

>-----Original Message-----
>From: talk-bounces at openstreetmap.org [mailto:talk-
>bounces at openstreetmap.org] On Behalf Of Richard Fairhurst
>Sent: 16 May 2006 22:05
>To: talk at openstreetmap.org
>Subject: Re: [OSM-talk] Re: One way streets
>
>On 16 May 2006, at 21:54, Simon Hewison wrote:
>
>> You've just described a roundabout. There's thousands of those. Big
>> ones, small ones, even some that you can traverse in either direction.
>> Many motorway junctions in Europe are one-way circles.
>
>That does raise an interesting question, though.
>
>When OSM data is used for routeing, describing roundabouts as circular
>one-way streets will adversely affect the output. For example:
>
>- At junction with the A1 and A1, turn left (A1).
>- At junction with the A1 and A1 in 0.05mi, turn left (A1).
>- At junction with the A1 and A1 in 9mi, turn left (A1).
>- At junction with the A1 and A1 in 0.05mi, turn left (A1).
>
>and so on. (That's the Stamford bypass, if it's not clear.)
>Topologically it makes perfect sense, but it's not very useful.
>
>When drawing roundabouts, then, what keys/values should we use to avoid
>this?
>
>Richard
>
>
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