Thailand

Plates large & white (passenger) / yellow (commercial)

Laos: Yellow on ordinary cars + right-hand traffic → Laos.

Drives on the left

Cambodia: Right-hand traffic + Khmer script → Cambodia.

Vietnam: Right-hand traffic + Latin (diacritic-heavy) script → Vietnam.

Laos: Right-hand traffic + Lao script → Laos.

Bollard square with pointed top, black-and-white stripes

Cambodia: Khmer script + right-hand traffic → Cambodia.

Laos: Lao script + right-hand traffic → Laos.

Indonesia: Indonesian (Latin) language + kabupaten signs → Indonesia.

Signposts square & bulky, usually white with black-painted bottoms

Within Southeast Asia this signpost design is unique to Thailand (per Plonk It) - outside SEA check other clues.

Concrete roads with a large square pattern are common

Philippines: Right-hand traffic + English/Tagalog signs → Philippines.

Indonesia: Indonesian language + black plates → Indonesia.

Poles square with small holes running vertically

Sri Lanka: Sinhala script + left-low-cam Gen4 → Sri Lanka.

Cambodia: Khmer script → Cambodia.

Laos: Lao script, right-hand traffic → Laos.

Thai script: compact, many fonts have tiny circles in the letters

Cambodia: Under-letter accents & pointier look → Cambodia.

Laos: Check the driving side: left = Thailand, right = Laos. Lao stop signs have 2 characters (Thai 3).

Yellow middle lines (solid or dashed)

Malaysia: Yellow centre line → Thailand, not Malaysia.

Street-light poles with red-black or black-white striped bottoms; distinct long thin lamp posts hanging over the road

Small-road directional signs: white two-part (arrow below, info above), road number with Garuda; highways green with Latin under the Thai names

Stop signs in Thai script (Laos: similar but only 2 characters instead of 3)

Road markers with white Garuda = national roads (white/black on the map), black Garuda = province roads (blue/yellow on the map)

Streets lined with flags - national + yellow royal flags

Distinctive green village signs all around the country

Most Gen3 has no visible car (rare: bike trekkers, white car with brake light)

Laos: Lao script + right-hand traffic → Laos.

Cambodia: Khmer script → Cambodia.

Area codes: Bangkok = 02, others 3 digits, geographically grouped - first digit already helps (mobiles 08/09, 06 non-regional)

National road first digit → region: 1 = north, 2 = northeast, 3 = centre, 4 = south (1-2 digit highways can cross regions)

Provincial roads: 2-letter Thai province abbreviation on waystones & signs (never on national-road ones); black boxes carry 3-letter abbreviations (ABC1234 or TCC-L2-ABC format)

Far south = Muslim-majority: Islamic attire, Jawi (Arabic-based) script, mosques

Landscape metas: flat & dry → north of Bangkok + east (east feels drier); tall mountains → northwest (+parts of peninsula); low smooth forested → centre-north; steep exposed rock → west + peninsula; red soil → mostly northeast; gravel roads → mapped areas

Plantation metas (south): rubber (black taps on trunks) mostly south; >90% of palm oil in the south; areca palms on the peninsula (esp. Ranong); garden croton (yellow/orange/red leaves) around Ranong & coasts

Rice: main belt mapped; dry-season rice → central plains (dry season = wildfire haze in the sky); wet-season rice → eastern plains

Coconut/palm metas: dense short-coconut plantations → west of Bangkok; tall-coconut plantations → Prachuap Khiri Khan; masses of palmyra palms → east peninsula coast (S of Bangkok + far south)

Crop metas: sugarcane → central/east; cassava (digitate leaves) → central + NE plains; corn → north/central; fruit → Chiang Mai-Lamphun valley + E-Sa-Kaeo/Chanthaburi; durian → Chanthaburi; pineapple → SE & SW of Bangkok; eucalyptus plantations → Sa Kaeo; teak (big leaves, yellow flowers) → north; Tenasserim pines → north/northwest only

Grey corrugated metal roofs → mostly north & south

Pole metas: Chilean-style indented poles → around Bangkok (thicker versions on highways everywhere); insulators with 7+ ridges → southern peninsula + Chiang Rai/Phayao highways (5-6 = standard); 1 insulator on crossbar → peninsula south of Ranong/Chumphon, 2 → rest of country

Wind turbines → W-Chaiyaphum & W-Nakhon-Ratchasima + coast of Songkhla/Nakhon Si Thammarat

Black bollard with three large white reflectors

Phuket: touristy & wealthy - modern buildings, resorts, heavy traffic among hills; Koh Samui & Koh Pha-Ngan: narrow crowded tropical roads

Taxis pink and yellow-on-green; street signs with small green section under blue (Bangkok & Nonthaburi)

Yellow-on-green taxis may rarely appear elsewhere - but pink taxis are practically exclusive to Bangkok.

Red songthaew trucks (shared-taxi pickups)

Street signs shaped like a ship's helm

Red street signs with golden decorated borders in Mueang Chiang Rai (blue variants exist)

Northern spotlights: Phrao valley (flat, ringed by mountains, rice+fruit); Doi Luang Chiang Dao (3rd-tallest, distinct shape); Phayao's long jagged N-S ridge; W-Tak rolling corn/sugarcane hills w/ very brown pavement; Phetchabun valley flanked by N-S ranges

Central/NE spotlights: Kanchanaburi deep-red cassava/rubber fields; SW-Lopburi distinct mountains; N-Saraburi E-W exposed-rock ranges; Chaiyaphum long flat ridges; Khao Yai NP tourist strip + rocky hills (camera smudge on the forest road!); N-Nakhon-Phanom karst views (on the Lao side); Mukdahan long low hills in mixed fields; SE-Nakhon-Ratchasima & S-Sisaket brown paved roads in crop fields

Southern spotlights: Khao Sam Roi Yot NP rock massifs (visible from the province centre); Khao Sok NP - tallest/steepest southern rock mountains (E-W); W-Krabi/E-Phang-nga N-S rock ranges

Grid spotlights: S-Lopburi NNW grid (rice/corn/sugarcane/cassava, ridges N/S/W); Pathum Thani near-perfect N-S grid; W-Rayong NE-SW industrial grid (rubber/cassava/pineapple); Highway 44 (Krabi-Surat Thani): divided 4-lane w/ huge median - often only a yellow inner line betrays it

Rare cars: visible-mirror car → only far southern Thailand (mostly overwritten by Gen4); Ko Sichang island car with bars protruding from the blur