On Fri, Dec 4, 2009 at 4:54 AM, Anthony <o...@inbox.org> wrote: > On Thu, Dec 3, 2009 at 12:38 PM, Steve Bennett <stevag...@gmail.com> > wrote: > > Well, put it this way: if this was implemented, I would duplicate far > > fewer roads in future. > > If it worked (and I really haven't delved into the details enough to > check), I might be convinced to add division information where I > otherwise wouldn't bother (because the current method of creating a > dual carriageway is a pain). >
Exactly. > > > If a router ignores the tags, it will occasionally try and send you > > through a barrier. > > For a U-turn? Whether or not a U-turn is legal should probably be > treated as "unknown" by routers in most cases. We're currently not > really mapping that at all. > I guess that's country specific. Here (Australia), u-turns are legal by default. But I'm not sure why routing software would need to do u-turns in general. > > OTOH, if you're talking about a left turn, I thought the point was > that this would be handled by turn restrictions just like would be > done currently. > I'll assume you're in a right-hand-side drive country? Let's take this situation: B | A==============C You're going from A to B. I'm saying that the router doesn't attempt to make the turn because the way A-C is marked as divided=median, and there's nothing at the intersection to overrule that. If left turns are possible there, then the junction should be marked as a gap, or there should be a section of non-divided at that point. Turn restrictions are a pain to edit, so it's great that the router gets a free hint here. Yeah, I see this as maybe a potential solution in between using a > single unmarked way and using a dual carriageway. Although, looking > at the proposal, it doesn't look finished - something you seem to > admit yourself. > Yep, I didn't write that proposal, I just liked the ideas in it. I guess tomorow I'll write up the summary of this discussion. Steve
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