The taxis in Bangkok were pretty dodgy and I'd heard some bad stories before I arrived. My friends and I stuck to the green/yellow cabs.
We also made sure though that we always asked for the meter when we used the taxis. If the driver didn't put it on, we didn't get in. We always followed a map with our finger and would point out monuments loudly. This prevented drivers from taking 'alternate' routes in what is a chaotic, disorientating place.
I'm sure we were highly annoying passengers, but we never got ripped off.
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