2008/4/24 Andy Robinson (blackadder) <[EMAIL PROTECTED]>: > I was expecting someone to point this out. My take is that the root tag is > the the highway and it has a number of lanes, not all of them necessarily > used. For instance, the M42 around Birmingham now has hard shoulder running > at certain times. So lanes=4 is right.
No - lanes=4 is right during those times that the shoulder is designated a running lane. These dynamic systems represent a problem for us in any case, since we want the map to inform the driver of the conditions, yet a simple lane count can't do that - he doesn't care about the hard shoulder as a presumed 4th lane if he can't drive in it. So let's pretend it isn't the M42 (it usually isn't). Does the M6 also have 4 lanes in your world? I'm cautious of the suggestion that including the hard shoulder is valid as a means of allowing accurate rendering of width. Partly because we have a width attribute, partly because we are free to add a hard-shoulder one and partly because lane widths differ across road types and countries. > having said all that I agree that knowing that only three lanes of a > motorway can be used is important too, No, it isn't important "too", it's the reason we have a lanes attribute (others should feel free to contradict me here). Knowing the width is important "too", and we have an attribute that we can use for it. > so I would suggest this be another > tag, running_lanes=3. Not required, if sufficient consensus exists that "lanes" is supposed to refer to running lanes, which I'm guessing is the case. > Its really only motorways where this issue crops up Not so: Ireland, for instance, uses hard shoulders on most non-urban roads. > (plus a few 3 lane roads where the central lane has been chevroned) so > having two tags for motorways and the few exceptions is probably no big > deal. Maybe I'll be surprised, but I suspect that your usage of "lanes" is a minority one. So if we need additional tags, it would be to record the existence of hard shoulders or any other non-running part of the road surface you consider interesting. But frankly, you'd be better off using the width attribute. Dermot -- -------------------------------------- Iren sind menschlich _______________________________________________ newbies mailing list [email protected] http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/newbies
