Bangkok's the same size as London, both in area and population.

London doesn't have many pedestrian streets, but there are plenty of barriers to traffic which still allow pedestrians to pass, and campaigns to make more streets pedestrian-only.

I would guess London has much better public transport, so people no need to use cars/motorbikes like in Bangkok, so the roads are not that necessary in London and can be assigned to pedestrians, while Skytrain in BKK is joke and only real alternative are river and canal express

Not much is better or cheaper than a Tuk-tuk, unless of course you value safety ;-)

tuktuk is expensive joke, pretty much on par with airconditioned taxi without inhaling exhaust smog and safe, both of them are in the end stucked in traffic jam, no matter that tuktuk is smaller

you must get of the roads not to be stucked in traffic unles you use (moto)bike, it's shame they canceled Bangkok green bike, used to bike using them long time ago, but was disapointed years ago when I found project was cancelled

Yup, if you are in a hurry, and have the testicular fortitude, a motorcycle is the quickest way anywhere.

Same in SF and LA where you can split lanes in traffic and use the carpool lanes. If you want to risk it the motorcycle is the fastest way around, even across the bridges.

London or greater London or the city?

Are you seriously pretending to think he's claiming Bangkok is the same size as the City of London?

The only non ambiguous term you gave is Greater London. Anyway when people say 'London' they mostly mean Greater London (or close enough to it).

You reminded me of this brilliant video:

https://www.youtube.com/watch?v=LrObZ_HZZUc

There are a ton of pedestrian only areas in NYC - Fulton Street, the Greenway, 33rd in the summer, etc. Most of them people don't realize used to be streets, like Diversity Plaza in JH. The full list is here (PDF warning): http://www.nyc.gov/html/dot/downloads/pdf/list-of-plazas.pdf