[OSM-talk] Cycle lanes

[Andy Robinson (blackadder)]

Lars Aronsson wrote:
>Sent: 25 March 2008 2:19 PM
>To: talk at openstreetmap.org
>Subject: Re: [OSM-talk] Cycle lanes
>
>OJ W wrote:
>
>> Sounds very similar to the cycleway tagging in Bedford; treat it
>> as a separate way if it's not on the road, which makes it easy
>> to show if it takes detours away from the road:
>
>But I want it to be just next to the street, with no gap and no
>overlap, and getting this right requires that I know how it will
>be rendered (which I don't), and there still is no chance I would
>get it perfectly right.  It does make more sense to draw one way
>at the street's centerline and then use attributes to describe all
>the various lanes for cars, buses, bikes and sidewalks as a list
>with the width of each lane in metres.  How far away is it that
>Osmarender or Mapnik would render something like that?
>
>We have this problem with motorways already, that two ways
>(northbound and southbound) run perfectly parallel in reality, but
>on the map the distance between the ways is not always the same.
>If this was mechanics, I would put a spacer washer between them.
>

Most of the UK motorway network is not strictly parallel. In some places
there is bigger divergence than a metre or two, elsewhere it varies because
the width of the central reservation varies, especially to accommodate
sight-lines around tighter curves. So, while I agree in general that
probably the majority of the network is effectively parallel its not always
the same distance from centre to centre of each carriageway.

Cheers

Andy

>
>--
>  Lars Aronsson (lars at aronsson.se)
>  Aronsson Datateknik - http://aronsson.se
>
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