The Amazing Race Asia season 3, episode 1September 11, 2008, only on AXN channel
It's leg #1A, the first part of leg number 1.

The starting line is at Saphan Phut, in Bangkok, Thailand, on May 20th.
Counting from the left are:
Mai & Oliver (Thailand),
A.D. & Fuzzie (Singapore),
Sam & Vince (Hong Kong),
Ida & Tania (Malaysia),
Bernie & Henry (Malaysia),
Kapil & Niroo (India),
Natalie & Pailin (Thailand),
William & Isaac (South Korea),
Neena & Amit (India),
Geoff & Tisha (Philippines).
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Take taxi to route marker #1

Neena & Amit (India)

Bernie & Henry (Malaysia)

Ida & Tania (Malaysia)

A.D. & Fuzzie (Singapore)

William & Isaac (South Korea)

Mai & Oliver (Thailand)

Natalie & Pailin (Thailand)
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Route Marker #1: find the Detour
Route Marker #2: find the Roadblock
Route Marker #3: go to Khao San Road and do the extra task
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Extra Task: both racers have to eat a bowl of bugs on Khao San Road

Neena & Amit (India)

Ida & Tania (Malaysia), William & Isaac (South Korea)

Kapil & Niroo (India), A.D. & Fuzzie (Singapore), Geoff & Tisha (Philippines), Ida & Tania (Malaysia), Sam & Vince (Hong Kong) are in this shot.
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Bernie & Henry (Malaysia)

Geoff & Tisha (Philippines)

William & Isaac (South Korea)
Clue says go to the 4th route marker.
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They go to this clue box and grab a yellow bag.

Clues say search for a bus ticket in the dark. Most teams change their clothes before this point.

OK, where's it?

Now take a bus to Chiang Mai. It's about 8-9 hours by bus from Bangkok.
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TBC.
To be continued next week. Everyone is safe in this episode.
Thanks to RFF, puddin, GeorgiaPeach, Neobie, CabioTAR, Jonlover, SlowHatch, Boingo, and all TAR detectives.