The picture above is a diagram of the Taoyuan Airport, Taipei, and as you can see in the diagram, some taxiways are named with two characters like “NC, NP, WC.” My question is: Is there any good reason, if any, why some taxiways are named with two characters when, clearly, there are other single letters still available?
Coding the taxiways this way makes it easy to create mnemonics. Note that from northwest to southeast, the first letters are alphabetically increasing. From southwest to northeast the numbers are increasing.
The combination of a letter and a number gives a good indication of the location of the taxiway.
Every taxiway close to the northern runway (5L-23R) is named Nx, everything close the southern runway (5R-23L) is called Sx. Numbering is from southwest to northeast, so N1 is close to the northern runway, at the west end (5L); S10 is the southern runway close to the eastern end (23L).
Letters can also be combined:
The apron side of the N taxiway is where you park, and called NP.
You cross on the east of the terminal on the eastern crossing or EC, or you cross on the west side of the terminal on WC or W2.
"Picha ya juu ni mchoro wa uwanja wa ndege wa Taoyuan, Taipei, na kama unavyoweza kuona katika mchoro, baadhi ya taxiways ni jina na herufi mbili kama ""NC,"" ""NP,"" ""WC"" Swali langu ni: Je, kuna sababu yoyote nzuri, kama yoyote, kwa nini baadhi ya taxiways ni jina na herufi mbili wakati, wazi, kuna herufi nyingine moja bado inapatikana?" Kuandika nambari za njia za kuendesha gari kwa njia hii hufanya iwe rahisi kuunda mnemonics. Ona kwamba kuanzia kaskazini-magharibi hadi kusini-mashariki, herufi za kwanza zinaongezeka kulingana na alfabeti. Kutoka kusini-magharibi hadi kaskazini-mashariki idadi hiyo inaongezeka. Mchanganyiko wa herufi na namba hutoa dalili nzuri ya eneo la taxiway. Kila taxiway karibu na runway kaskazini (5L-23R) inaitwa Nx, kila kitu karibu na runway kusini (5R-23L) inaitwa Sx. Nambari ya N1 ni kutoka kusini magharibi hadi kaskazini mashariki, kwa hivyo N1 iko karibu na runway ya kaskazini, upande wa magharibi (5L) na S10 ni runway ya kusini karibu na mwisho wa mashariki (23L). Herufi pia inaweza kuunganishwa: upande apron ya N taxiway ni ambapo wewe kuegesha, na aitwaye NP. Msafara wa mashariki wa terminal, au msafara wa magharibi wa terminal, au msafara wa magharibi wa terminal, au msafara wa magharibi wa terminal.