It also depends on the time you are trying to get a taxi. For example around 7pm lot of taxidrivers will ask you where to go opposed to just wait for you to say it. Mostly even from outside the car, this is because they almost finish working and have to give the car to the next guy. So they like to stay in a specific area. Always two, sometimes three drivers share a taxi, with 12 hour work shifts.
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It might have something to do with Chinese New Year also
Ive noticed it is harder to get a taxi now and yesterday a driver told me that lot of drivers are around the airport, trainstations, where they try to get customers without using their meter. During this time, he said, lot of drivers dont want to use the meter, since its so busy with people coming in and out of the city.