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For hailing a taxi at Hongqiao, this is a good reference. I wouldn't recommend going to the in-station parking lots by following the signs. Drivers there might not come to your exact pickup spot, and it's a real pain trying to find your car. Also, it seems drivers only get a couple of free entries into the parking lot daily, so you might have to pay an extra 10 RMB for parking. If you don't pay it, the driver might get grumpy. It's better to follow the advice in this post and catch a taxi from outside the station area.