Odd and even sois

Every soi number on Sukhumvit tells you which side of the road it's on. Odd numbers branch north. Even numbers branch south. Soi 3 and Soi 4 face each other. Nana Nuea and Nana Tai. Nuea means north. Tai means south. The numbers climb as you head east. Asok is Soi 21. Phrom Phong, 39. Thong Lo, 55. Ekkamai, 63. Above the road runs the Skytrain. Open since 1999. And Sukhumvit doesn't stop in Bangkok. It runs 488 kilometres. All the way to the Cambodian border. We tell you everything you need to know about Bangkok. Follow for more!

Sukhumvit's soi numbers tell you which side of the road you are on: odd sois branch north, even sois south, and the numbers climb as you head east. The Skytrain runs above it, and the road runs 488 km to the Cambodian border.

• Sukhumvit Road's sois are numbered from west to east: odd numbers branch off its north side (north-east, in Wikipedia's words), even numbers its south side (south-west).
• Soi 3 is Nana Nuea (North Nana) and Soi 4, opposite it, is Nana Tai (South Nana): in Thai, nuea (เหนือ) means north and tai (ใต้) means south.
• Asok Montri is Soi 21, Phrom Phong is Soi 39, Thong Lo is Soi 55 and Ekkamai is Soi 63, each with a Skytrain station of the same name.
• The BTS Skytrain opened on 5 December 1999, its Sukhumvit Line then running from Mo Chit to On Nut; the line's eastern part is built on top of Sukhumvit Road.
• Sukhumvit Road (Thai: ถนนสุขุมวิท, Highway 3) is 488 km long and ends at the Cambodian border in Khlong Yai District, Trat.

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Sources:
– Wikipedia: Sukhumvit Road: https://en.wikipedia.org/wiki/Sukhumvit_Road
– Wikipedia: Thong Lo BTS station: https://en.wikipedia.org/wiki/Thong_Lo_BTS_station
– Wikipedia: BTS Skytrain: https://en.wikipedia.org/wiki/BTS_Skytrain
– Bangkok Post, Thailand Journey timeline (1999): BTS opens its first rail: https://thailandjourney.bangkokpost.com/timeline/1999/bts-opens-its-first-rail
– Wiktionary: เหนือ (nuea): https://en.wiktionary.org/wiki/%E0%B9%80%E0%B8%AB%E0%B8%99%E0%B8%B7%E0%B8%AD
– Wiktionary: ใต้ (tai): https://en.wiktionary.org/wiki/%E0%B9%83%E0%B8%95%E0%B9%89

Facts and sources: https://soibysoi.com/episodes/odd-and-even-sois

The map is schematic: soi spacing and the route line are illustrative.
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