Talk:Subic–Clark–Tarlac Expressway

Comments
The Subic Clark Tarlac Expressway is of two sections, the Subic to Clark Section (50.5 kms) and the Clark to Tarlac (41.24 kms)section.

Question
Is Subic-Clark Expressway the distinct or part of the Subic-Clark-Tarlac Expressway? --seav 16:13, 29 August 2006 (UTC)


 * Subic-Clark expressway is only a part of the Subic-Clark-Tarlac expressway. The Subic-Clark-Tarlac expressway is an expressway project consisting of the Subic-Clark Expressway and the extension of the North Luzon Expressway from its current end in Santa Ines, Mabalacat to Tarlac City.

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 * SCTEX new logo.png

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Expressway 4
According to the DPWH road data from 2018 and 2019, the Subic–Clark segment of the SCTEX is part of E4 as opposed to the DPWH's GIS web apps saying that it's part of E1. — hueman1 ( talk •  contributions ) 16:45, 17 January 2021 (UTC)
 * I think the best way to determine whether SCTEX's official designation is E1 or E4 is that we should look for the latest legal document issued by the DPWH on how it classify the said highway.--ERAMnc 05:15, 19 January 2021 (UTC)


 * I think the sources above are the only references that we have right now. This seems like a dead end here since, according to my knowledge, there are no route markers/shields posted anywhere along the road. — hueman1 ( talk •  contributions ) 10:22, 19 January 2021 (UTC)


 * I found this PDF file from foi.gov.ph. It seems outdated though. Here, the Manila–Cavite Expressway (CAVITEX) is E4 and the SCTEX (Subic–Clark segment) is E5. — hueman1 ( talk •  contributions ) 10:28, 19 January 2021 (UTC)


 * It really looks like a dead end. I checked the issuance by the DPWH but the latest legal document related to highway numbering was in 2014. I also tried to access the 2017 road data reference on Philippine highway network article but said file could no longer be found. I think the DPWH should sort this matter as early as possible before there be confusion among secondary sources on referring to the route no. of the said highway network.--ERAMnc 16:54, 19 January 2021 (UTC)


 * I'm gonna request for an updated version of the PDF file above at foi.gov.ph. Maybe it could help us to sort things up. — hueman1 ( talk •  contributions ) 01:26, 20 January 2021 (UTC)


 * Comment It is probably both E1 and E4. Its segment running from Clark interchange with NLEX to Tarlac forming a part of the north-south route of E1, while its short Clark to Subic segment joining the SFEx forms the east-west E4 route, a spur of E1. At least that's what it looks like from the maps. E4 doesnt terminate at Dinalupihan from Olongapo, it actually covers the entire expressway route to where it connects to the north-south Balintawak-to-La Union E1 route.--RioHondo (talk) 07:20, 21 January 2021 (UTC)


 * Then E4 expressway (Philippines) should have its own article and should not be a redirect for Subic Freeport Expressway. — hueman1 ( talk •  contributions ) 07:57, 21 January 2021 (UTC)


 * As the Philippine expressway network is a fairly recent program of the DPWH, it's going to take some time for reliable sources to appear and start covering these routes. It was only recently too that we completed all Metro Manila circumferential and radial routes considering that that highway scheme has been in place for decades lol. Will start writing as more sources become available. Perhaps the next administration will give more clarity and guidance as to these routes especially when more toll roads are finally completed to give us a better understanding of the network to be formed.--RioHondo (talk) 08:10, 21 January 2021 (UTC)

Where exit KM posts for the Subic-Clark section is based
The current article as of February 26, 2023 states that it was unclear until now where KM 0 for the exit numbering system for the Subic-Clark section (E4) is based. It stumped me as well when examining the DPWH ArcGIS data as KM posts for national roads around the Subic area is nowhere near KM 90, if we'll count from Tipo's exit number. But using Google Maps and Street View data, I have an answer now.

E4's exit numbers are based on a reverse counting of the KM posts from Mabalacat to Subic.

If we remember, the Clark-Tarlac section counts from where NLEX left off (KM 88) as the natural progression of E1. In E4, KM posts count southwards normally from Mabalacat to Subic (where KM 88 S is in Mabalacat and KM 150 S is in Subic). For exit numbering, they used the same distance, but instead of starting from Mabalacat, the premise is that KM 88 is instead in Subic, and KM 150 ends in Mabalacat.

We can make a mathematical approach for proof. It seemed that E4 started counting exit numbers in reverse from KM 151+000 (90 meters from Argonaut Bridge, which is KM 150+900) so for anyone willing to cross-check my computation can do so with ease (my computation may be off by around 100-200 meters).

From KM 151+000, we'll count from Exit 88 upwards: SBMA Toll Gate: 88 + 4.4 = 92.4 -> Exit 92 Dinalupihan offramp: 88 + 18.7 = 106.7 -> Exit 107 Floridablanca offramp: 88 + 37.4 = 125.4 -> Exit 125 Porac offramp: 88 + 51 = 139 -> Exit 139 Clark South: 88 + 61 = 149 -> Exit 149 Mabalacat/NLEX: 88 + 62.3 => 150.3 => Exit 150

From the existing table, only Tipo exit (given as 91) did not fit within this computation, but it seems that it was because the Subic Freeport Expressway article used exit numbers starting at 83 and counting from Rizal/Martian junction (I can't find any photos yet of exit numbers in SFEx, which would be a great reference)

I'll try deriving the distances from toll fees next to see where SCTEX jurisdiction ends and SFEx jurisdiction begins so we can definitively define the source of exit numbering in both SCTEX and SFEx to make a more accurate article. Redsherry16 (talk) 04:05, 26 February 2023 (UTC)