On Tue, Sep 30, 2008 at 7:29 PM, Gregory Williams <[EMAIL PROTECTED]> wrote: >> -----Original Message----- >> From: [EMAIL PROTECTED] [mailto:talk-gb- >> [EMAIL PROTECTED] On Behalf Of LeedsTracker >> Sent: 30 September 2008 18:49 >> To: [email protected] >> Subject: Re: [Talk-GB] Cycle lane in one direction only >> >> 2008/9/30 Andrew Chadwick (mailing lists) <andrewc-email- >> [EMAIL PROTECTED]>: >> >> > Suggestions of different things to use in place of :left and :right >> > would be very welcome. I'd suggest keeping it defined in terms that >> > allow rendering without foreknowledge of which side of the road one >> > cycles/drives in a particular country. >> >> Can't we use the direction of the way being tagged? E.g. >> cycleway:withway=<any permissible value for cycleway> >> cycleway:againstway=<any permissible value for cycleway> >> >> If neither withway/againstway are given, assume both ways as default > > If you did that then you'd need to know which side of the road you cycle > on in order to be able to render a lane on the correct side. >
There are cases you have to know whichever scheme you use. Left/right works for renderers, but is no use for routers, and forward/backward works for routers, but not for renderers. Luckily figuring out what the general rule of the road is probably isn't /that/ hard. There are a limited number of countries that drive on the left and most of them are islands making the bounding box easy, and the biggest land borders are pretty much India+Pakistan and southern Africa (both of which are comparitively sparse border areas, unlikely to be too obsessed with cycle facilities). At least that's the situation wikipedia implies [1], so it must be true :-) Dave [1] http://en.wikipedia.org/wiki/Drive_on_the_left _______________________________________________ Talk-GB mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-gb
