Or "hei che." By this we mean black market taxis, not literally color of the cab. Yes, beware of touts that approach you. Yesterday I arrived back in Beijing on a domestic flight, and was heading towards the escalator down to the legit taxi queue on the lower level. When a lady literally leaped off her bench and went straight for me asking in English "taxi? where you go?". Clearly targeting the obvious foreigner and not any Chinese person. Of course, I snarled at her, told her I was a Beijingren, and go stuff her hei che where it won't easily fit. And proceeded to queue. Non-Mandarin speakers may just safely ignore these pests and proceed to the taxi queue, following the clear signage in the terminal.