Dear Totor, I only discovered your message in my spam folder yesterday. I was the one who edited and put all those ref by DPWH on primary roads (doing some tests, checking for patterns all over PH)
The reason for the delay in reply is that I need to type an extensive guidelines on trunk-editing (for osm learners) which is confusing to many. I am fact-checking existing examples in OSM PH, where I myself broke the recommended road classifications of DPWH many times. It's better to explain by-example (and reason why), so that other mappers reading this can benefit from discussion (links: to follow later) My edits in Cebu Proper: Route 8 (camino real) which is classified as primary by DPWH (equivalent to trunk road) in OSM. I initially followed faithfully the DPWH's route - which in "many times" proven as outdated. Is the current trunk route shape still valid? Reroute if necessary, but leave the DPWH ref value intact. Route 840 coastal road (by-pass or diversion road), which also appeared as trunk on OSM. I initially decided to downgrade this to primary route - prior to testing and consultations with local mappers (see my personal guidelines below - second rule) As for the 2 bridges that goes to the airport (they also run in parallel) - having the same function (applying my second rule). I did not touch Marcelo Fernan route (check edit history) :-) I just saw the original route on DPWH's database, the Marcelo Fernan isn't even on DPWH (probably a city or provincial road - national road?) - didn't noticed coz I was in a hurry that time (forgot to open a discussion for consultation). If you feel Marcelo Fernan qualifies more as a trunk than the other bridge (considering the guidelines below), then by all means, tag it correctly as you see it on the ground. Anyways, better this way... "somebody breaks something" (as I always break something, hehe), we have more people interested in reading and learning, how we will solve this :-) Please see my personal notes below. Cheers, Rally ============================================================ I use the following guidelines (rules) in my head in editing primary and arterial roads. This is not yet an extensive list and I wish we can get more ideas from others. *First Rule*: Don't follow DPWH recommended routes, they are just guide. They're outdated in so many areas (I will show many examples in various areas that doesn't make sense). *Second Rule*: No two (or more) trunk should run in parallel routes (having same regional function). The typical case of (old) Camino Real vs. (new) Diversion/By-Pass Road -- choosing which one will be the designated provincial or regional trunk road in OSM map? (forget DPWH). But you should only have one trunk crossing a town or typical city, by looking at it in the regional or provincial perspective. *Clue: look at the intention of DPWH (regional planning). Have they widened the old primary routes (to maintain primary status)? But if the Diversion Road is being redesigned with more capacity: twice as wide, twice as fast as the old route, and is actually used by regional motorists, then the answer is obvious. * This is tricky in example Lubao By-Pass Road (Pampanga). Maybe because said By-pass road is not a National Road? same case with Marcelo Fernan Bridge (not on DPWH) If we notice, DPWH uses the same concept: they rarely have two 'primary' running in parallel. eg. In the case of NCR, even if Alabang-Zapote is far from Sucat Road, they tag Sucat Road as primary, Alabang-Zapote as secondary (even if the latter is allegedly part of the old Daang Maharlika). My theory is that DPWH treat these two road serving the same function (in the future): linking SLEX (E2) to CAVITEX (E3/E4). But I tend to disagree and will recommend Alabang-Zapote be tagged as Trunk, because I believe Daang Hari will become trunk someday, then it will violate my *Third Rule.* *Third Rule:*Trunk should not terminate in the middle of somewhere. It should typically terminate on: (1) another trunk road (2) expressway (3) major port/gateway: international airport or seaport, or a major ro-ro terminal (SRNH) (4) self-contained major city, eg. provincial capital (5) circumferential provincial roads that ends on itself (in some islands) examples: - trunk road stopping at Tabuk, Kalinga (because it's the capital) - decision to extend Quezon Ave (N170) from Mabuhay Rotonda to the nearest trunk, which is AH26 (N120 Roxas Blvd) via N150(Padre Burgos) instead of via N170 (Taft Ave back to EDSA); because routing to Taft Ave will break the Second Rule (running parallel trunks with N120(Roxas Blvd) and N145(South Super) which are also both located in Manila, all going in the same direction to EDSA. *Fourth Rule:* Test if it is really "THE" trunk road. This is a tricky balancing act, considering its function, the original govt design and how ALL (INCLUSIVE) motorists actual use them. (I had contradicted/reverted my own edits so many times, after the questions like:) (a) If I close down one of the two: (old) Camino Real route, or the new Diversion Route, which will have more negative economic impact (regionally). Which will create more regional traffic chaos (in an all inclusive consideration)? (b) Am I aware of the bigger picture (future 'regional role' of a particular road section - eg. being groomed as gateway, happening in 2 years)? Is there an exception: should I break the *First Rule* here? Is it located on a mega-city that can support 2 or more parallel trunks: One trunk for the LGU (serving its own numerous internal primary routes); another trunk (a non-expressway) acting as regional by-pass road. (c) Did I check my personal biases for trunk? - Is it because it's my favorite, or the faster route? - "I want our road to be more visible." (tagging for the renderer - common with newbie mappers) - exclusive consideration: private-vehicles' perspective (car carries lesser people per trip) - am I mapping for the leisure travelers (tourist map)? (d) Inclusive Mobility test: Did I consider that Provincial Public Transport perspective (carrying more "road-user commuters" per vehicle)? Should they all be assigned to Primary road instead of Trunk Road for private car users. This is different for local buses (for local users) which in IMHO should be rerouted away from regional trunk roads. (e) Did I consider the regional trucker's route (delivering goods and services that fuels regional economy)? Aren't they entitled to the overall traffic-count that dictates which are considered trunk roads? (or should I assume they don't exist) A huge truck having large road-footprint may (just) represent any: - Driver & "pahenante" (professional perspective) - Business perspective (logistics company or private entity) - Or the bulk of Goods, Products and Services these trucks represent note: IMHO and personal bias, Public Transport (d) have a higher weight for decision as trunk. BUT it must be supported by data/figures. Should we consult the DPWH or the DOTC or the DTI on this, or we just trust the government powerpoint presentations future plans and programs? *Fifth Rule:* Every province should have it's own (map-visible) provincial road - It is a set of serially-connected ways (LGU's main arterial roads), passable (no missing bridges), and actually paved (not just on drawing board of DPWH) that may qualify as a trunk (in terms of road design); and especially if this road passes "provincial boundary" linking to National Highway Network (NHN). - AND this need not follow "volume-kilometerage" qualification by DPWH to be primary class - WHY? remote places with substantial population have long been neglected, and need visible roads (a little nudge from from map makers) that connects US to THEM - ...fully aware that we "should not be tagging for the renderer", but I'm "tagging trunk or primary for social justice and equality" IF said road qualifies the minimum road quality & pass-ability. Yes, it's a personal bias; my digital activism ;-) eg. Had I not made a stupid mistake of prioritizing Marikina-Infanta road as trunk, over the more favored Infanta-bound route N601 (via Manila East Road), then only the adventurous would have seen Sitio Camagong / Little Baguio (a nice little cold sitio) or eat at Jariel's peak, pass a protected forest in Sierra Madre. To this day, Marikina-Infannta road is still a tertiary road, (virtually invisible as far as DPWH is concerned), considering the shelved plan to put a major seaport in Infanta (which automatically makes it a trunk). This puts to waste (all the concrete and) tax-payers money if nobody think this road exist (thus now, will remain tagged as primary in OSM). eg. Saranggani province may not have a trunk road if I don't have a (break-the-rule) fifth rule :-) since it's main arterial road remains "secondary class" per DPWH So what is not (a trunk)? if there already a trunk road in the province, then that lone primary road that leads to a remote town (with no major port), then it's just a primary road. eg. Calatagan, Batangas *Sixth Rule: *Is the *First Rule* still valid? We need to keep that in check always. As we move towards data transparency, DPWH will soon find itself catching up, and volunteer mappers will also adjust to approximate government plan (comparing with DOTC-LTFRB routes). At some point we will close the GAP. The reason we should be rushing things on DPWH routes (first phase), because on the second phase, we will put all DOTC/LTFRB public transport and truckers route in OSM's relation, and compare these public_transport route data with DPWH, as well as opinion of private road users. This will truly help us visualize the road that support the bulk of road users (which is the correct trunk road).
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