Well, unlike the SCTEX-NLEX link road, the Tabang Spur Road is named "Road" and not "Link". In addition, the spur road itself has ramps from the Krus road [1][2] which suggests that the Tabang Spur Road itself functions as a motorway--a branch of NLEX. (Also, I think those ramps from Krus road are the actual motorway_links.) I guess MapQuest's rendering is a rendering problem, but ignoring Garmin's and MapQuest's data/rendering peculiarities for a moment, I am inclined to think that the Tabang Spur Road is a motorway itself based on the function.<br>
<br>[1] <a href="http://osm.org/go/4zOraYSkS--">http://osm.org/go/4zOraYSkS--</a><br>[2] <a href="http://maps.google.com/?ie=UTF8&ll=14.834795,120.885401&spn=0.002572,0.004882&t=k&z=18">http://maps.google.com/?ie=UTF8&ll=14.834795,120.885401&spn=0.002572,0.004882&t=k&z=18</a>><br>
<br><br><div class="gmail_quote">On Sat, Jul 24, 2010 at 10:54 AM, Rally de Leon <span dir="ltr"><<a href="mailto:ralleon@gmail.com">ralleon@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Clark Spur Road (CSR) & Tabang Spur Road (TSR) can be seen on mapquest<br>
at mapscale 3200meters & below, but both (and all motorwaylinks) start<br>
to disappear from the mapquest at scale 7000meters & up.<br>
<br>
I'm the one who converted TSR to motorwaylink (since it connects NLEX<br>
to AH26), with the idea that we can make it appear on GPS maps to have<br>
a better 'transition color' from motorway-to-trunk, or<br>
motorway-to-primary, rather than from 'motorway color' directly (and<br>
abruptly) to 'trunk or primary color', since some of them are<br>
connected directly 'in-line'.<br>
<br>
For uniformity, I just patterned TSR tag similar to existing CSR<br>
'motorway_link' tag (which connects NLEX to AH26 to SCTEX); 'coz as<br>
the name suggests, it "links" :-) But the problem in both cases, is<br>
that they are 'too long' to be noticed as 'missing' or disconnected<br>
when you zoom out, unlike ordinary ramps.<br>
<br>
Motorway Link is used on osmph mainly as tag for 'shorter' for<br>
fast/slow exit roads (which have driving speeds between 30-60kmh<br>
depending on the width/length).<br>
<br>
In comparison to Garmin map (besides Motorway, Trunk & Primary Roads),<br>
they assigned separate 'hexcodes' for 'Low-Speed Ramp (exit road)',<br>
'High-Speed Ramp (exit road)' & 'Major Highway Connector'; so it's<br>
easy to manipulate the speed, how & when each will render on the map.<br>
<br>
In the absence of differentiating tags in osmph, Spur road, Highway<br>
Connectors & Ramps are tagged similarly as 'motorway_link', thus<br>
creating this problem.<br>
<br>
My impression of a 'Major Highway Connector' on Garmin maps: refers to<br>
these long spur roads (ground level, tunnel or bridge), or even those<br>
'long unclassified flyovers' like the one that connects Global city to<br>
Buendia. It passes over Kalayaan Ave & EDSA, yet this connector<br>
road/bridge is not considered part or portion of 32nd St, Kalayaan Ave<br>
or EDSA or Buendia. Its sole purpose is just to 'link' (major roads)<br>
like 32nd St & Buendia.<br>
<br>
Should we convert all long 'motorway_links' like Spur Roads to<br>
'motorways' (or primary roads depending on location), since they<br>
function like a motorway (like limited exits, high-speed), if so what<br>
is the minimum 'road length' to differentiate from motorway_links?<br>
<br>
Or we leave them as it is, until a new osm classification is made for<br>
'spur road / major highway connector'?<br>
<br>
Or we just ask mapquest to make motorwaylinks appear up to 7000meter scale :-)<br>
<div><div></div><div class="h5"><br>
<br>
On Sat, Jul 24, 2010 at 1:20 AM, Eugene Alvin Villar <<a href="mailto:seav80@gmail.com">seav80@gmail.com</a>> wrote:<br>
> Hi guys,<br>
><br>
> I noticed that MapQuest doesn't render NLEx's Tabang Spur Road in lower zoom<br>
> levels[1] and this is apparently because it is tagged as<br>
> highway=motorway_link.<br>
><br>
> Is this the correct classification? I think the whole spur road should still<br>
> be highway=motorway and the entry/exit ramps are the ones that should be<br>
> highway=motorway_link. What do you think?<br>
><br>
> [1] <a href="http://open.mapquest.co.uk/mq/9-9Gv6VZ29f2D8ToOQ6o1u" target="_blank">http://open.mapquest.co.uk/mq/9-9Gv6VZ29f2D8ToOQ6o1u</a><br>
><br>
><br>
> Eugene<br>
><br>
><br>
><br>
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</blockquote></div><br><br clear="all"><br>-- <br><a href="http://vaes9.codedgraphic.com">http://vaes9.codedgraphic.com</a><br>