[talk-ph] Classification of the NLEx Tabang Spur Road

Eugene Alvin Villar seav80 at gmail.com
Sat Jul 24 04:16:32 BST 2010

As for the Clark Spur Road, it looks kinda like an overly long link road.[1]
But the connecting ramps to MacArthur Hwy makes me think that it might be a
very short motorway itself. I haven't formed an opinion on this road yet.


On Sat, Jul 24, 2010 at 11:11 AM, Eugene Alvin Villar <seav80 at gmail.com>wrote:

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

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